Greasy Fork is available in English.
A userscript that takes the player's current name input into the player name box, and then edits it to make it funni. The name is then copied to your clipboard.
Updates: 1.0.1: Added in like one line of code that takes the player's most current input into the playerNameInput, something that my dumb self did not realize localStorage.playerNameInput did not do. Anyways that's fixed now, so now the player name box actually acts like an input for your name.
Updates 1.0.2: Made the name just appear in the name box idk what I didn't do this a year ago but I did it now.