"set" is evaluated at compile time, and then ignored. To give a verb a new name at run time, you have to create a new version of the verb and add it to the player or object or whatever, at least, I believe this is the case... the Blue Book explains this, but I've never needed to use this technique.
[EDIT]

If you could clarify what you need to do here... I mean, if all you need to do is change the name once, at the beginning of the game, set name should do fine.