Jack, John, Johnny, and Jon are a couple of nicknames.
João
The Union Jack is the nickname of the UK flag.
His name was Jack Rackham. His nickname was Calico Jack
Jonathan Kalbfeld goes by Jack.
The nickname of Jill in the movie "Jack and Jill" is "Jilly."
JFK and Jack
The nickname for the British flag is the Union Jack. Although it is only correctly known as this when flown on a ship.
UNON JACK
His nickname is Black Jack
"Jack"
Jack Handey The Nickname - 2013 was released on: USA: 11 July 2013