diff --git a/README.md b/README.md
index 527a9f732..e63b25c95 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ Gogs - Go Git Service [![Build Status](https://travis-ci.org/gogits/gogs.svg?bra
 
 ![](https://github.com/gogits/gogs/blob/master/public/img/gogs-large-resize.png?raw=true)
 
-##### Current tip version: 0.9.51 (see [Releases](https://github.com/gogits/gogs/releases) for binary versions)
+##### Current tip version: 0.9.52 (see [Releases](https://github.com/gogits/gogs/releases) for binary versions)
 
 | Web | UI  | Preview  |
 |:-------------:|:-------:|:-------:|
diff --git a/gogs.go b/gogs.go
index d8da7069e..64bb1980e 100644
--- a/gogs.go
+++ b/gogs.go
@@ -17,7 +17,7 @@ import (
 	"github.com/gogits/gogs/modules/setting"
 )
 
-const APP_VER = "0.9.51.0723"
+const APP_VER = "0.9.52.0723"
 
 func init() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
diff --git a/models/org.go b/models/org.go
index d2cb18893..9cb862dec 100644
--- a/models/org.go
+++ b/models/org.go
@@ -94,7 +94,7 @@ func (org *User) RemoveOrgRepo(repoID int64) error {
 
 // CreateOrganization creates record of a new organization.
 func CreateOrganization(org, owner *User) (err error) {
-	if err = IsUsableName(org.Name); err != nil {
+	if err = IsUsableUsername(org.Name); err != nil {
 		return err
 	}
 
diff --git a/models/repo.go b/models/repo.go
index e1073419a..d5ca030d9 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -19,7 +19,6 @@ import (
 	"strings"
 	"sync"
 	"time"
-	"unicode/utf8"
 
 	"github.com/Unknwon/cae/zip"
 	"github.com/Unknwon/com"
@@ -517,34 +516,6 @@ func (repo *Repository) CloneLink() (cl *CloneLink) {
 	return repo.cloneLink(false)
 }
 
-var (
-	reservedNames    = []string{"debug", "raw", "install", "api", "avatar", "user", "org", "help", "stars", "issues", "pulls", "commits", "repo", "template", "admin", "new", ".", ".."}
-	reservedPatterns = []string{"*.git", "*.keys", "*.wiki"}
-)
-
-// IsUsableName checks if name is reserved or pattern of name is not allowed.
-func IsUsableName(name string) error {
-	name = strings.TrimSpace(strings.ToLower(name))
-	if utf8.RuneCountInString(name) == 0 {
-		return ErrNameEmpty
-	}
-
-	for i := range reservedNames {
-		if name == reservedNames[i] {
-			return ErrNameReserved{name}
-		}
-	}
-
-	for _, pat := range reservedPatterns {
-		if pat[0] == '*' && strings.HasSuffix(name, pat[1:]) ||
-			(pat[len(pat)-1] == '*' && strings.HasPrefix(name, pat[:len(pat)-1])) {
-			return ErrNamePatternNotAllowed{pat}
-		}
-	}
-
-	return nil
-}
-
 // Mirror represents a mirror information of repository.
 type Mirror struct {
 	ID          int64 `xorm:"pk autoincr"`
@@ -940,8 +911,17 @@ func initRepository(e Engine, repoPath string, u *User, repo *Repository, opts C
 	return nil
 }
 
+var (
+	reservedRepoNames    = []string{".", ".."}
+	reservedRepoPatterns = []string{"*.git", "*.wiki"}
+)
+
+func IsUsableRepoName(name string) error {
+	return isUsableName(reservedRepoNames, reservedRepoPatterns, name)
+}
+
 func createRepository(e *xorm.Session, u *User, repo *Repository) (err error) {
-	if err = IsUsableName(repo.Name); err != nil {
+	if err = IsUsableRepoName(repo.Name); err != nil {
 		return err
 	}
 
@@ -1209,7 +1189,7 @@ func TransferOwnership(u *User, newOwnerName string, repo *Repository) error {
 func ChangeRepositoryName(u *User, oldRepoName, newRepoName string) (err error) {
 	oldRepoName = strings.ToLower(oldRepoName)
 	newRepoName = strings.ToLower(newRepoName)
-	if err = IsUsableName(newRepoName); err != nil {
+	if err = IsUsableRepoName(newRepoName); err != nil {
 		return err
 	}
 
diff --git a/models/user.go b/models/user.go
index e8e79f247..a7c877140 100644
--- a/models/user.go
+++ b/models/user.go
@@ -18,6 +18,7 @@ import (
 	"path/filepath"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/Unknwon/com"
 	"github.com/go-xorm/xorm"
@@ -468,9 +469,43 @@ func NewFakeUser() *User {
 	}
 }
 
+var (
+	reversedUsernames    = []string{"debug", "raw", "install", "api", "avatar", "user", "org", "help", "stars", "issues", "pulls", "commits", "repo", "template", "admin", "new", ".", ".."}
+	reversedUserPatterns = []string{"*.keys"}
+)
+
+// isUsableName checks if name is reserved or pattern of name is not allowed
+// based on given reversed names and patterns.
+// Names are exact match, patterns can be prefix or suffix match with placeholder '*'.
+func isUsableName(names, patterns []string, name string) error {
+	name = strings.TrimSpace(strings.ToLower(name))
+	if utf8.RuneCountInString(name) == 0 {
+		return ErrNameEmpty
+	}
+
+	for i := range names {
+		if name == names[i] {
+			return ErrNameReserved{name}
+		}
+	}
+
+	for _, pat := range patterns {
+		if pat[0] == '*' && strings.HasSuffix(name, pat[1:]) ||
+			(pat[len(pat)-1] == '*' && strings.HasPrefix(name, pat[:len(pat)-1])) {
+			return ErrNamePatternNotAllowed{pat}
+		}
+	}
+
+	return nil
+}
+
+func IsUsableUsername(name string) error {
+	return isUsableName(reversedUsernames, reversedUserPatterns, name)
+}
+
 // CreateUser creates record of a new user.
 func CreateUser(u *User) (err error) {
-	if err = IsUsableName(u.Name); err != nil {
+	if err = IsUsableUsername(u.Name); err != nil {
 		return err
 	}
 
@@ -583,7 +618,7 @@ func VerifyActiveEmailCode(code, email string) *EmailAddress {
 
 // ChangeUserName changes all corresponding setting from old user name to new one.
 func ChangeUserName(u *User, newUserName string) (err error) {
-	if err = IsUsableName(newUserName); err != nil {
+	if err = IsUsableUsername(newUserName); err != nil {
 		return err
 	}
 
diff --git a/templates/.VERSION b/templates/.VERSION
index 33af4b850..82c3ae6af 100644
--- a/templates/.VERSION
+++ b/templates/.VERSION
@@ -1 +1 @@
-0.9.51.0723
\ No newline at end of file
+0.9.52.0723
\ No newline at end of file