The song was written for John Lennon's son, Julian Lennon. The original title of the song was "Hey Jules" but was changed to make it flow better.
"Na, na na, na na na na, na na na na, Hey Jude" - everyone
2. I saw Sir Paul McCartney on Saturday Night Live on TV perform "Hey Jude". People in the audience screamed their heads off. One time when Paul was singing the vocals for this song in the studio (or maybe during a Beatles TV performance) he screamed so intensely he passed out. He didn't konk out when performing on SNL that night.