Right to the point: I have a stream where i am regular viewer Guild Wars 2 game, but there is a player who plays in competitive scene of that game, known to the streamer i watch and his viewers.

I've been mistaken for that player many times in streamer's twitch chat because of my nickname, which is similar to that player's nickname.

I don't want to change my global nickname because on other streams it's fine, but for that stream alone, where i am constantly mistaken for someone else, i would set some unique nickname.

I.e. Just like Discord's server nicknames can be unique.