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”.

Mojang will give Minecraft players the ability to change their name on February 4th. While it's a pretty simple process, there are some important rules to be aware of.