Hello! If you've ever played DDLC (Doki Doki Literature Club), it's very similar! When you download a game off itch.io, Steam, or whatever website that can be used, the game can scan over basic information about your device and system. In this case, your real name was used instead of the one you entered in before because Father had used your system account name (if you are on a Windows device, this would be the Windows username).