Is there a way to change a short name in OS X
Use these steps to change the short username of an account on your computer:


Open System Preferences
Choose the "Users &amp; Groups" preference pane
If the padlock at the bottom left is locked, click on it to unlock it with an administrator password
Control-click on the account in the users list
A menu will appear with "Advanced Options…". Select that and you will get a sheet where you can change the account name.