Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., greets a supporter during a campaign event at Joseph A. Craig High School, Aug. 27, 2012, in Janesville, Wis. (Mary Altaffer/AP Photo)

CLEVELAND-The United States Secret Service code names chosen by the Ryans have been revealed. Paul Ryan's is " Bowhunter ," while Janna Ryan's is "Buttercup," according to a campaign aide.

Another staffer tells ABC News that one of Paul Ryan's favorite movies is "The Princess Bride" and he calls his wife Buttercup, which is where they got the code name from. Buttercup is the name of the female lead in the cult classic.

Bowhunter is more obvious as Paul Ryan is a skilled archer. He bow hunts deer and other animals. He's spoken of his joy of hunting on the campaign trail especially in his native Wisconsin and in Oklahoma, where his wife is from.

Each family's secret service code name begins with the same letter. Sarah Palin was Denali while her husband Todd was Driller. President Obama is Renegade, while Michelle Obama is Renaissance. Vice President Joe Biden is Celtic, while wife Jill is Capri.

The top of the ticket, Mitt Romney is Javelin.

Code names are no longer as security sensitive since the Secret Service radio traffic is now scrambled.

Both the Ryans' code names as well as Romney's was first reported by GQ.