Spider Man 3 star Tobey Maguire, 31, and his jewelry designer fiancée, Jen Meyer, 29, have decided to name their daughter Ruby, Us Weekly has learned.

Why? “Because they treasure her like a jewel,” says a friend of Meyer’s. “And they also just like the name.”

Ruby was born at Cedars Sinai Hospital in Los Angeles, California, on November 10. Maguire and Meyer have been engaged since April of 2006. This is the couple’s first child.