To change your Minecraft name in the Java Edition, head to Minecraft.net and log in with your account. Once done, head to the profile page, look for the Minecraft: Java Edition box, and click ...

How do I find my Minecraft username? On the change name screen, you can see your previous name located right after the field “Current Java/Bedrock Profile Name”.

Minecraft 1.19: Java Edition username can be changed directly from the official website (Image via Sportskeeda) Chart New Territories with the ultimate Minecraft Seed Generator!