As an individual you can use any name you want as long as you don't represent yourself as another person. But you can use the same name. You don't need to file anything. Surprisingly it's not fraud or anything. You can sign using another name to. Just like you can sign with an "x". Now some forms will ask you if you have ever used another name and you would have to disclose it. It's very odd and surprising. https://court.laws.com/alias