We define table prefix while using Gii. In your case you need to set it to tbl_. Then it should generate UserController instead of TblUserController.
– The Yii Framework employees a class naming convention whereby the names of the classes directly plot to the directories in where they are stored. The root level directory of the Yii Framework is the “framework/” directory, where all classes are stored hierarchically. Class names contain alphanumeric characters.