I made a tool to generate a patch for that over
here.
It's a bit wonky because the text is done through sprite tiles rather than the usual message tiles used for like level names and message boxes. Because of this, not every letter is available by default (specifically most capital letters); you have to manually add graphics for those to either GFX00 or GFX0D in order to use them. More details for doing that are given in the tool.
You're also limited to only 84 non-whitespace characters, so for a name longer than the original Mario like Squeeg/Skyrio, you'll have to adjust the rest of the text to be slightly shorter. If you know a bit of ASM you might be able to add some more by hijacking around the relevant tables, but the tool itself doesn't handle that.
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