I read this in the support FAQ's:

After the transfer, if two or more characters with the same first and last name exist in the same World, only one character can keep the name, based on the order of priority below.

1. Characters that qualify for Legacy status.
2. Characters whose subscriptions ended after September 30, 2012.
3. Characters that were created first.

In the event that your character must be renamed, please enter a new name by following the on-screen instructions when you first log in following the World transfer.
* Players may voluntarily rename their characters even if their name takes precedence.



im guessing by that last line, that its possible to change your name by making a diff char on a diff server and transferring it to your current character. even though you had priority over the name you can have an optional name change. is this correct?