diff --git a/kustomize/internal/commands/build/build.go b/kustomize/internal/commands/build/build.go
index c3a165226..9b68af7c3 100644
--- a/kustomize/internal/commands/build/build.go
+++ b/kustomize/internal/commands/build/build.go
@@ -67,8 +67,9 @@ func NewCmdBuild(
 	pl := plugins.NewLoader(pluginConfig, rf)
 
 	cmd := &cobra.Command{
-		Use:          "build {path}",
-		Short:        "Print configuration per contents of " + pgmconfig.KustomizationFileName0,
+		Use: "build {path}",
+		Short: "Print configuration per contents of " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example:      examples,
 		SilenceUsage: true,
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -96,7 +97,8 @@ func NewCmdBuild(
 func (o *Options) Validate(args []string) (err error) {
 	if len(args) > 1 {
 		return errors.New(
-			"specify one path to " + pgmconfig.KustomizationFileName0)
+			"specify one path to " +
+				pgmconfig.DefaultKustomizationFileName())
 	}
 	if len(args) == 0 {
 		o.kustomizationPath = loader.CWD
diff --git a/kustomize/internal/commands/build/build_test.go b/kustomize/internal/commands/build/build_test.go
index 47c17bca4..0a997d674 100644
--- a/kustomize/internal/commands/build/build_test.go
+++ b/kustomize/internal/commands/build/build_test.go
@@ -26,7 +26,9 @@ func TestBuildValidate(t *testing.T) {
 		{"file", []string{"beans"}, "beans", ""},
 		{"path", []string{"a/b/c"}, "a/b/c", ""},
 		{"path", []string{"too", "many"},
-			"", "specify one path to " + pgmconfig.KustomizationFileName0},
+			"",
+			"specify one path to " +
+				pgmconfig.DefaultKustomizationFileName()},
 	}
 	for _, mycase := range cases {
 		opts := Options{}
diff --git a/kustomize/internal/commands/create/create.go b/kustomize/internal/commands/create/create.go
index 6fef7867f..9d12850eb 100644
--- a/kustomize/internal/commands/create/create.go
+++ b/kustomize/internal/commands/create/create.go
@@ -162,7 +162,7 @@ func detectResources(fSys fs.FileSystem, uf ifc.KunstructuredFactory, base strin
 			}
 			// If a sub-directory contains an existing kustomization file add the
 			// directory as a resource and do not decend into it.
-			for _, kfilename := range pgmconfig.KustomizationFileNames() {
+			for _, kfilename := range pgmconfig.RecognizedKustomizationFileNames() {
 				if fSys.Exists(filepath.Join(path, kfilename)) {
 					paths = append(paths, path)
 					return filepath.SkipDir
diff --git a/kustomize/internal/commands/edit/add/addmetadata.go b/kustomize/internal/commands/edit/add/addmetadata.go
index 97d956b28..4159ab6bf 100644
--- a/kustomize/internal/commands/edit/add/addmetadata.go
+++ b/kustomize/internal/commands/edit/add/addmetadata.go
@@ -46,8 +46,9 @@ func newCmdAddAnnotation(fSys fs.FileSystem, v func(map[string]string) error) *c
 	o.kind = annotation
 	o.mapValidator = v
 	cmd := &cobra.Command{
-		Use:   "annotation",
-		Short: "Adds one or more commonAnnotations to " + pgmconfig.KustomizationFileName0,
+		Use: "annotation",
+		Short: "Adds one or more commonAnnotations to " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		add annotation {annotationKey1:annotationValue1},{annotationKey2:annotationValue2}`,
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -66,8 +67,9 @@ func newCmdAddLabel(fSys fs.FileSystem, v func(map[string]string) error) *cobra.
 	o.kind = label
 	o.mapValidator = v
 	cmd := &cobra.Command{
-		Use:   "label",
-		Short: "Adds one or more commonLabels to " + pgmconfig.KustomizationFileName0,
+		Use: "label",
+		Short: "Adds one or more commonLabels to " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		add label {labelKey1:labelValue1},{labelKey2:labelValue2}`,
 		RunE: func(cmd *cobra.Command, args []string) error {
diff --git a/kustomize/internal/commands/edit/remove/removemetadata.go b/kustomize/internal/commands/edit/remove/removemetadata.go
index afd6e84bc..e03759368 100644
--- a/kustomize/internal/commands/edit/remove/removemetadata.go
+++ b/kustomize/internal/commands/edit/remove/removemetadata.go
@@ -47,7 +47,8 @@ func newCmdRemoveAnnotation(fSys fs.FileSystem, v func([]string) error) *cobra.C
 	o.arrayValidator = v
 	cmd := &cobra.Command{
 		Use:   "annotation",
-		Short: "Removes one or more commonAnnotations from " + pgmconfig.KustomizationFileName0,
+		Short: "Removes one or more commonAnnotations from " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		remove annotation {annotationKey1},{annotationKey2}`,
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -67,7 +68,8 @@ func newCmdRemoveLabel(fSys fs.FileSystem, v func([]string) error) *cobra.Comman
 	o.arrayValidator = v
 	cmd := &cobra.Command{
 		Use:   "label",
-		Short: "Removes one or more commonLabels from " + pgmconfig.KustomizationFileName0,
+		Short: "Removes one or more commonLabels from " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		remove label {labelKey1},{labelKey2}`,
 		RunE: func(cmd *cobra.Command, args []string) error {
diff --git a/kustomize/internal/commands/edit/remove/removepatch.go b/kustomize/internal/commands/edit/remove/removepatch.go
index f211e6770..ab62e90e5 100644
--- a/kustomize/internal/commands/edit/remove/removepatch.go
+++ b/kustomize/internal/commands/edit/remove/removepatch.go
@@ -25,7 +25,8 @@ func newCmdRemovePatch(fsys fs.FileSystem) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "patch",
-		Short: "Removes one or more patches from " + pgmconfig.KustomizationFileName0,
+		Short: "Removes one or more patches from " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		remove patch {filepath}`,
 		RunE: func(cmd *cobra.Command, args []string) error {
diff --git a/kustomize/internal/commands/edit/remove/removeresource.go b/kustomize/internal/commands/edit/remove/removeresource.go
index fa49dfd53..e1fd462d9 100644
--- a/kustomize/internal/commands/edit/remove/removeresource.go
+++ b/kustomize/internal/commands/edit/remove/removeresource.go
@@ -23,7 +23,8 @@ func newCmdRemoveResource(fsys fs.FileSystem) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "resource",
-		Short: "Removes one or more resource file paths from " + pgmconfig.KustomizationFileName0,
+		Short: "Removes one or more resource file paths from " +
+			pgmconfig.DefaultKustomizationFileName(),
 		Example: `
 		remove resource my-resource.yml
 		remove resource resource1.yml resource2.yml resource3.yml
diff --git a/kustomize/internal/commands/kustfile/kustomizationfile.go b/kustomize/internal/commands/kustfile/kustomizationfile.go
index 3152f0235..61cdf5f7b 100644
--- a/kustomize/internal/commands/kustfile/kustomizationfile.go
+++ b/kustomize/internal/commands/kustfile/kustomizationfile.go
@@ -119,7 +119,7 @@ func NewKustomizationFile(fSys fs.FileSystem) (*kustomizationFile, error) { // n
 func (mf *kustomizationFile) validate() error {
 	match := 0
 	var path []string
-	for _, kfilename := range pgmconfig.KustomizationFileNames() {
+	for _, kfilename := range pgmconfig.RecognizedKustomizationFileNames() {
 		if mf.fSys.Exists(kfilename) {
 			match += 1
 			path = append(path, kfilename)
@@ -128,7 +128,9 @@ func (mf *kustomizationFile) validate() error {
 
 	switch match {
 	case 0:
-		return fmt.Errorf("Missing kustomization file '%s'.\n", pgmconfig.KustomizationFileName0)
+		return fmt.Errorf(
+			"Missing kustomization file '%s'.\n",
+			pgmconfig.DefaultKustomizationFileName())
 	case 1:
 		mf.path = path[0]
 	default:
@@ -228,7 +230,6 @@ func (mf *kustomizationFile) marshal(kustomization *types.Kustomization) ([]byte
 			return content, nil
 		}
 		output = append(output, content...)
-
 	}
 	return output, nil
 }
diff --git a/kustomize/internal/commands/kustfile/kustomizationfile_test.go b/kustomize/internal/commands/kustfile/kustomizationfile_test.go
index fbf5fa6c7..065b43c71 100644
--- a/kustomize/internal/commands/kustfile/kustomizationfile_test.go
+++ b/kustomize/internal/commands/kustfile/kustomizationfile_test.go
@@ -97,7 +97,7 @@ func TestNewNotExist(t *testing.T) {
 	}
 }
 
-func TestSecondarySuffix(t *testing.T) {
+func TestAllKustomizationFileNames(t *testing.T) {
 	kcontent := `
 configMapGenerator:
 - literals:
@@ -105,14 +105,16 @@ configMapGenerator:
   - baz=qux
   name: my-configmap
 `
-	fSys := fs.MakeFsInMemory()
-	fSys.WriteFile(pgmconfig.KustomizationFileName1, []byte(kcontent))
-	k, err := NewKustomizationFile(fSys)
-	if err != nil {
-		t.Fatalf("Unexpected Error: %v", err)
-	}
-	if k.path != pgmconfig.KustomizationFileName1 {
-		t.Fatalf("Load incorrect file path %s", k.path)
+	for _, n := range pgmconfig.RecognizedKustomizationFileNames() {
+		fSys := fs.MakeFsInMemory()
+		fSys.WriteFile(n, []byte(kcontent))
+		k, err := NewKustomizationFile(fSys)
+		if err != nil {
+			t.Fatalf("Unexpected Error: %v", err)
+		}
+		if k.path != n {
+			t.Fatalf("Load incorrect file path %s", k.path)
+		}
 	}
 }
 
diff --git a/kustomize/internal/commands/testutils/testutils.go b/kustomize/internal/commands/testutils/testutils.go
index d0004915b..4c27d9bc6 100644
--- a/kustomize/internal/commands/testutils/testutils.go
+++ b/kustomize/internal/commands/testutils/testutils.go
@@ -38,10 +38,10 @@ func WriteTestKustomization(fSys fs.FileSystem) {
 
 // WriteTestKustomizationWith writes content to a well known file name.
 func WriteTestKustomizationWith(fSys fs.FileSystem, bytes []byte) {
-	fSys.WriteFile(pgmconfig.KustomizationFileName0, bytes)
+	fSys.WriteFile(pgmconfig.DefaultKustomizationFileName(), bytes)
 }
 
 // ReadTestKustomization reads content from a well known file name.
 func ReadTestKustomization(fSys fs.FileSystem) ([]byte, error) {
-	return fSys.ReadFile(pgmconfig.KustomizationFileName0)
+	return fSys.ReadFile(pgmconfig.DefaultKustomizationFileName())
 }
diff --git a/pkg/kusttest/kusttestharness.go b/pkg/kusttest/kusttestharness.go
index cf3a2b83e..4eb480c21 100644
--- a/pkg/kusttest/kusttestharness.go
+++ b/pkg/kusttest/kusttestharness.go
@@ -74,7 +74,10 @@ func (th *KustTestHarness) WriteF(dir string, content string) {
 }
 
 func (th *KustTestHarness) WriteK(dir string, content string) {
-	th.WriteF(filepath.Join(dir, pgmconfig.KustomizationFileName0), `
+	th.WriteF(
+		filepath.Join(
+			dir,
+			pgmconfig.DefaultKustomizationFileName()), `
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 `+content)
diff --git a/pkg/loader/fileloader_test.go b/pkg/loader/fileloader_test.go
index abcda6c25..2f8576dd1 100644
--- a/pkg/loader/fileloader_test.go
+++ b/pkg/loader/fileloader_test.go
@@ -389,7 +389,8 @@ func TestNewLoaderAtGitClone(t *testing.T) {
 	fSys.MkdirAll(coRoot)
 	fSys.MkdirAll(coRoot + "/" + pathInRepo)
 	fSys.WriteFile(
-		coRoot+"/"+pathInRepo+"/"+pgmconfig.KustomizationFileName0,
+		coRoot+"/"+pathInRepo+"/"+
+			pgmconfig.DefaultKustomizationFileName(),
 		[]byte(`
 whatever
 `))
diff --git a/pkg/pgmconfig/pgmconfig.go b/pkg/pgmconfig/pgmconfig.go
index 83325e400..caad76517 100644
--- a/pkg/pgmconfig/pgmconfig.go
+++ b/pkg/pgmconfig/pgmconfig.go
@@ -4,22 +4,23 @@
 // Package pgmconfig holds global constants for the kustomize tool.
 package pgmconfig
 
-// KustomizationFileNames is a list of filenames
+// RecognizedKustomizationFileNames is a list of file names
 // that kustomize recognizes.
-// To avoid ambiguity, a directory cannot contain
-// more than one match to this list.
-func KustomizationFileNames() []string {
+// To avoid ambiguity, a kustomization directory may not
+// contain more than one match to this list.
+func RecognizedKustomizationFileNames() []string {
 	return []string{
-		KustomizationFileName0,
-		KustomizationFileName1,
-		KustomizationFileName2}
+		"kustomization.yaml",
+		"kustomization.yml",
+		"Kustomization",
+	}
+}
+
+func DefaultKustomizationFileName() string {
+	return RecognizedKustomizationFileNames()[0]
 }
 
 const (
-	KustomizationFileName0 = "kustomization.yaml"
-	KustomizationFileName1 = "kustomization.yml"
-	KustomizationFileName2 = "Kustomization"
-
 	// An environment variable to consult for kustomization
 	// configuration data.  See:
 	// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
diff --git a/pkg/target/chartinflatorplugin_test.go b/pkg/target/chartinflatorplugin_test.go
index 3d6e4ae71..ca17d91b2 100644
--- a/pkg/target/chartinflatorplugin_test.go
+++ b/pkg/target/chartinflatorplugin_test.go
@@ -11,7 +11,7 @@ import (
 	"testing"
 
 	kusttest_test "sigs.k8s.io/kustomize/v3/pkg/kusttest"
- "sigs.k8s.io/kustomize/v3/pkg/plugins/testenv"
+	"sigs.k8s.io/kustomize/v3/pkg/plugins/testenv"
 )
 
 // This is an example of using a helm chart as a base,
diff --git a/pkg/target/kusttarget.go b/pkg/target/kusttarget.go
index 55624903b..a35861a91 100644
--- a/pkg/target/kusttarget.go
+++ b/pkg/target/kusttarget.go
@@ -81,7 +81,7 @@ func commaOr(q []string) string {
 func loadKustFile(ldr ifc.Loader) ([]byte, error) {
 	var content []byte
 	match := 0
-	for _, kf := range pgmconfig.KustomizationFileNames() {
+	for _, kf := range pgmconfig.RecognizedKustomizationFileNames() {
 		c, err := ldr.Load(kf)
 		if err == nil {
 			match += 1
@@ -92,7 +92,7 @@ func loadKustFile(ldr ifc.Loader) ([]byte, error) {
 	case 0:
 		return nil, fmt.Errorf(
 			"unable to find one of %v in directory '%s'",
-			commaOr(quoted(pgmconfig.KustomizationFileNames())),
+			commaOr(quoted(pgmconfig.RecognizedKustomizationFileNames())),
 			ldr.Root())
 	case 1:
 		return content, nil