HELP!!!!

HELP!!!!

HI, i want to know if it is there any way to selecta dropdown menu depending on the user that is creating the record.

What I want is to add a field where i can see the Complete Name of the user that saved that record.
This is because USER names are really strange, so i want to create something like:

If username == "jd2012" then
Owner = "John Doe"


So, i can create a list of the users witrh the correct name, but i want to know if this is possible!

thanks in advance
Pablo