how do i get the real name from a snapchat username?

[Gotta]

Only way would be if they told you. Sucks but nobody puts what their snapchat username is one other sites so there would be no way to find it. Sorry :/
Maybe try and check their best friends on snap chat? see if you know any and then ask them who it is. If you got nothing try and figure it out through clever questions. Try and figure it out in 5 snaps or less and you can still stay clever.
Sucks there is no other way.

Hope This Helps.