since i download the SP demo and try the Co-Op mod , when i join a game in MP my name is alway MOHAA, i go to multiplayer option, change my name ect ect, i click aply and its ok, but when i rejoin a new game my name is MOHAA again!! this is very frustrating

How did you join the game? If you use All Seeing Eye, for example, when you join from there it uses whatever name is used in All Seeing Eye, get my drift?

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Another useless post by Echo

Type
name xxx
in console
xxx being the name
name Manny
for example
change your name ingame!

Is it possible to use colour in your name, you can with other Quake 3 games, like Wolfenstein and Quake 3 itself.

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Another useless post by Echo

i use all seeing eye...

i try the console name xxx

but my name in game is [EC]Cpt. Sobel but when i type enter only the [EC]Cpt is my name.. maybe cause of the "." in Cpt. sobel

Have you tried: name "[EC]Cpt. Sobel". (With the quotes? Not sure if it works, but might as well try)

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Another useless post by Echo

Yup. If you want more than one word to be part of the name you have to type it inbetween "'s.

Example:
I rock you
name "I Rock you"

i have got the same problem with all seeing eye too but i changed in multiplayer options!
and if i start a new game its still there!