In the following, short tutorial you can learn how to rename your Sims first name. In the Neighbourhoodscreen, open up the cheat window and enter the cheat: boolprop TestingCheatsEnabled true Enter a lot, shift-click on a sim and click 'more...' until you see: Spawn... Then choose Tombstone of L and D When the tombstone has appeared, you may disable the boolprop cheat with boolprop TestingCheatsEnabled false Then just click on the Tombstone, choose More... and then click Rename Sim A textbox will appear in which you can enter the new name.