How to change in-game Nickname in Splatoon 3. Learn how to change the default player name including the location where to customize the player ID Nickname shown in the Splashtag.
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How To Change Default Player Name
Play Turf War Once

At the beginning of the game, the player's id name starts as "Player". If you go to the lobby and play a Turf War (Regular Battle), a dialogue cut scene event will occur in the lobby after the match ends and you will be given an option to decide the nickname you would like to use.
How To Change Nickname
Name Can Be Changed At Any Time From The Lobby Terminal

After the first player name change, you can change your nickname at any time at the lobby terminal. At the lobby terminal, you can also change the battle record and Splashtag.
Nickname Cannot Be Changed For 30 Days After Changing

If you change your Nickname, you will not be able to change it for the next 30 days. You can change your nickname as many times as you like, but you won't be able to change it until you wait for a certain period of time, so be careful when changing your nickname.