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If you meant Login name you can not change it, support can't change it either, once you set login name when you sign up to steam it's set in stone on your account.
Thx
Also FYI Login names are hidden from public, no one can see your login name only you, and steam support can see login name. The display name is not the same as login name, they're two separate different things, the display name you can change, it also display to the public, while login name is a private name you don't share as that only used to login, or to recover the account if you somehow lost access fully to account like email lost, or you login to a scam site, and such. Hope this is clear.
Display name may not change on the fly while in game as may require you to relaunch the game in order to take effect, unless game has a delay system of it own where may take X amount of time.