To change a character name in Minecraft Dungeons, you usually need to change your Xbox gamertag or Microsoft display name, because the game pulls the name from your account rather than from the character screen itself.

How to do it

  1. Sign in to your Xbox/Microsoft account.
  2. Go to the gamertag change page.
  3. Pick an available new name and confirm it.
  4. Restart Minecraft Dungeons and log back in.

Important note

This affects the name shown in-game across platforms, including PlayStation and PC versions linked to that account, because the name is tied to the Xbox account system.

If you meant a different game

For Minecraft-style games with a separate character rename option, the process can be different. In some games you rename from the character-select screen, but Minecraft Dungeons itself is account-based.

TL;DR: Change the Xbox/Microsoft gamertag, then relaunch the game.