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 ...

Your Minecraft name is usually your Gamertag for whatever platform you play on. It identifies you to other players in multiple games, including Minecraft. There are ways to change your Minecraft name ...

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”.