diff --git a/src/main/scala/gitbucket/core/controller/AccountController.scala b/src/main/scala/gitbucket/core/controller/AccountController.scala
index 93d3a99..6223eb5 100644
--- a/src/main/scala/gitbucket/core/controller/AccountController.scala
+++ b/src/main/scala/gitbucket/core/controller/AccountController.scala
@@ -715,7 +715,7 @@
 
   private def existsAccount: Constraint = new Constraint() {
     override def validate(name: String, value: String, messages: Messages): Option[String] =
-      if (getAccountByUserName(value).isEmpty) Some("User or group does not exist.") else None
+      if (getAccountByUserNameIgnoreCase(value).isEmpty) Some("User or group does not exist.") else None
   }
 
   private def uniqueRepository: Constraint = new Constraint() {
@@ -727,7 +727,7 @@
     ): Option[String] = {
       for {
         userName <- params.optionValue("owner")
-        _ <- getRepositoryNamesOfUser(userName).find(_ == value)
+        _ <- getRepositoryNamesOfUser(userName).find(_.equalsIgnoreCase(value))
       } yield {
         "Repository already exists."
       }
diff --git a/src/main/scala/gitbucket/core/controller/ControllerBase.scala b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
index ecb3d13..7c4c00b 100644
--- a/src/main/scala/gitbucket/core/controller/ControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
@@ -349,7 +349,7 @@
 
   protected def uniqueUserName: Constraint = new Constraint() {
     override def validate(name: String, value: String, messages: Messages): Option[String] =
-      getAccountByUserName(value, true).map { _ =>
+      getAccountByUserNameIgnoreCase(value, true).map { _ =>
         "User already exists."
       }
   }
@@ -386,9 +386,10 @@
     "groups",
     "new"
   )
+
   protected def reservedNames(): Constraint = new Constraint() {
     override def validate(name: String, value: String, messages: Messages): Option[String] =
-      if (allReservedNames.contains(value)) {
+      if (allReservedNames.contains(value.toLowerCase)) {
         Some(s"${value} is reserved")
       } else {
         None
diff --git a/src/main/scala/gitbucket/core/controller/IndexController.scala b/src/main/scala/gitbucket/core/controller/IndexController.scala
index e6f8311..528aebf 100644
--- a/src/main/scala/gitbucket/core/controller/IndexController.scala
+++ b/src/main/scala/gitbucket/core/controller/IndexController.scala
@@ -222,7 +222,7 @@
    * Returns a single string which is any of "group", "user" or "".
    */
   post("/_user/existence")(usersOnly {
-    getAccountByUserName(params("userName")).map { account =>
+    getAccountByUserNameIgnoreCase(params("userName")).map { account =>
       if (account.isGroupAccount) "group" else "user"
     } getOrElse ""
   })
diff --git a/src/main/scala/gitbucket/core/service/AccountService.scala b/src/main/scala/gitbucket/core/service/AccountService.scala
index 543f743..65c7ae0 100644
--- a/src/main/scala/gitbucket/core/service/AccountService.scala
+++ b/src/main/scala/gitbucket/core/service/AccountService.scala
@@ -95,6 +95,13 @@
   def getAccountByUserName(userName: String, includeRemoved: Boolean = false)(implicit s: Session): Option[Account] =
     Accounts filter (t => (t.userName === userName.bind) && (t.removed === false.bind, !includeRemoved)) firstOption
 
+  def getAccountByUserNameIgnoreCase(userName: String, includeRemoved: Boolean = false)(
+    implicit s: Session
+  ): Option[Account] =
+    Accounts filter (
+      t => (t.userName.toLowerCase === userName.toLowerCase.bind) && (t.removed === false.bind, !includeRemoved)
+    ) firstOption
+
   def getAccountsByUserNames(userNames: Set[String], knowns: Set[Account], includeRemoved: Boolean = false)(
     implicit s: Session
   ): Map[String, Account] = {
diff --git a/src/main/twirl/gitbucket/core/account/newrepo.scala.html b/src/main/twirl/gitbucket/core/account/newrepo.scala.html
index 52ad759..fa0f307 100644
--- a/src/main/twirl/gitbucket/core/account/newrepo.scala.html
+++ b/src/main/twirl/gitbucket/core/account/newrepo.scala.html
@@ -32,7 +32,7 @@
         <dl>
           <dt>Repository name</dt>
           <dd style="margin-left: 0px;">
-            <input type="text" name="name" id="name" class="form-control" style="width: 200px;" autofocus />
+            <input type="text" name="name" id="name" class="form-control" style="width: 200px; display: inline;" autofocus/>
             <span id="error-name" class="error"></span>
           </dd>
         </dl>