Ned Stark's supposed bastard child Jon Snow turned out to be "the prince that was promised " .
This was revealed in the last episode of its sixth season.
Reports coming indicates that Bran Stark revealed Jon's real name in an interview with a magazine,and the name is Jaenerys Targaryean..
A Reddit post claims to show the leaked upcoming new issue of Empire Magazine which includes an article about season 7. Citing an interview with Isaac Hempstead Wright (Bran Stark), the article seems to reveal the true name of Jon Snow: Jaehaerys Targaryen.
Game of thrones 7 airs on 17th July,2017..