Why do you want to rename the uke? to name it the big bully you always wanted to kill in real life?
also, there is an /lp command so you can do /lp 1 (name) without worrying about the update, it simply changes the name and if that name is existing, it's looks.
And there is a stable (non-repeating) way to do it, to your local disk and into the games folder and into the toribash folder, the default.cfg is there, open that one up with notepad, find
nick "uke"
(Note: it should be under the first line of the thing)
replace uke with any name and you are done (It actually replaces uke like an /lp, so doing nick "hampa" will make the uke look like hampa