Sheriff Stilinski: I have a son. His name is Mieczysław Stilinski. But we call him Stiles. I remember. When Stiles was a little kid, he couldn’t say his first name. Not sure why. It pretty much rolls off the tongue. But, uh, the closest he could get was “mischief.” His mother called him that until…

From Teen Wolf – Season 6 Episode 8: ‘Blitzkrieg’ (6×08)