On CSGO you can have any name you want basically.
You would have to use your steam account and change the name there.
But you can have a steam og id/link.
I don't know.
I have http://steamcommunity.com/id/exports which you can use to do stuff like check inventory and profile and shit.
Idk.....
Also I think some people like like some id or something under 5 numbers.
I don't use Steam much but I've seen some of these on the market.