remove theme’s name from dashboard .. How?

by

Your options are to hide the right now widget or to change the theme name in style.css

To remove the right now widget that shows the theme name.
enter image description here

To change the theme name open style.css and change the theme name in the header. If your using the WordPress file editor activate another theme before you change the name in the header.

 /*
Theme Name: Your Theme Name
Theme URI: http://example.com
Description: My WordPress theme description
Version: .99
Author: My Name
Author URI: http://example.com
*/