Ben Golliver, Sports Illustrated (9/18/13)
Hold on, because this back story gets a little complicated: the Express-News reports that the newly-christened Jeff Ayres was born Jeff Orcutt (his mother's maiden name) and that he didn't know who his biological father was until later in life. He then switched to Jeff Pendergraph while in elementary school when his mother married his stepfather, who is apparently no longer a part of Pendergraph's life. From there, Ayres decided to go through the process of taking his biological father's name after he and his wife had a daughter in June.
Spurs' Jeff Pendergraph Legally Changes His Surname to 'Ayres'