Actually, it was the opposite. Oquendo was the name of Snell's wife, which he took when they had a baby somewhere around 2000. A couple of years ago, he decided to revert to Snell.
From Pirate Report Online, Sept. 2003:
«Oquendo wants to go back to being called Ian Snell, which is his proper name. However, when his son was born following the 2000 season, Oquendo decided to go by his baby's mother's surname.
"I know the name thing has caused some confusion and some writers have had fun with it, calling me the player to be named later," Oquendo said. "However, there are personal family reasons behind it that I don't consider a joking matter."»