The player name in Rocket League is the Steam name by default. When playing in split-screen mode, the second player's name is Steam Name(2).
I have tried a few things suggested in Youtube Videos:
- modify the Registry (the mentioned key does not exist in my Registry)
- change
ALI231.ini(doesn't exist on my PC) - change
Steam_API.ini(doesn't exist on my PC)
Best Answer
From what I have seen, this is an intended feature and cannot be fixed for local split-screen players.
From here:
On PS4, it does this as well if the other players are logged in as guests, but displays their usernames if they log in.