Changing your short username is a serious procedure, but ChangeShortName makes doing so easier and safer.
ChangeShortName is "donationware" by James Bucanek and Dan Frakes. Be sure to read the included documentation before using it.
- Complete rewrite of the ChangeShortName Helper application, which has been renamed ChangeShortName (i.e., without the "Helper"). The new version is a Cocoa application with a new interface that's easier to use and provides more-and more useful-information and feedback. The downside of this rewrite is that the ChangeShortName application is no longer compatible with Mac OS X 10.2.x; more...
RequirementsMac OS X 10.4 (Tiger) or earlier. (Can be used with Mac OS X 10.2 using the included Terminal script.) NOTE: The current version, 1.3, is NOT compatible with Mac OS X 10.5 (Leopard); an update will be released.
*Previously available here