How to change name in Undertale
Go to Undertale's save files on your computer. Delete or rename the 'file0' and ‘undertale.ini’ files, then restart the game. Voila, new name time!
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Short version: Nuke your save file. Long version: Find 'file0' and new-name your heart out!
From experience, just start a new save -- it's simpler and it avoids file tampering! Trust me, it's worth it for a clean slate.
You can't change your name in-game once you've set it, but you can reset your Undertale save data to start fresh with a new name!
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