Stiles real name is Mieczyslaw Stilinski. In the show Teen Wolf, Sheriff Stilinski reveals his sons real name during an episode in season 6. Stiles couldnt pronounce his name when he was young, so the closest he got was "mischief," which quickly became a nickname that Claudia gave him. The name Mieczyslaw is a Polish name that means "sword" and "glory". The showrunner Jeff Davis chose this name because it was difficult to spell and pronounce, and it sounded like "mischief," which was a perfect word to describe Stiles.