Natalie Portman
Natalie Portman's given name comes from her Israeli culture. She was born with a traditional Hebrew name, Neta-Lee Hershlag. When her family emigrated to the U.S. in 1984, they changed their surname to Portman, her grandmother's maiden name.
Kit Harington
The "Game of Thrones" heartthrob Kit Harington revealed that his parents didn't tell him that his real name wasn't Kit until he was 11 years old. "I think they could see that I wanted to be Kit, but Christopher was a bit of a tradition," Harington explained. "My brother's name is Jack, but his real name is John. Kit is traditionally an offshoot of Christopher, it's just not used that often. My middle name is Catesby."