Sarah Michelle Gellar and Freddie Prinze Jr. name baby boy Rocky James

Sarah Michelle Gellar and her husband, Freddie Prinze Jr., named their baby boy Rocky James, the former "Buffy the Vampire Slayer" star tells Us Weekly.

The acting couple, who met on the set of "I Know What You Did Last Summer" and have been married 10 years, welcomed their son in September. Rocky has an older sister, 3-year-old Charlotte Grace.

Gellar didn't explain the inspiration for their son's unusual moniker (Sylvester Stallone movie marathon, mayhaps?), but he shares his middle name, James, with his famous grandfather, the late Freddie Prinze.