Surhoff's father Dick played two years in the NBA in 1952–1953 and 1953–1954 and his brother Rich appeared in nine games in 1985 as a relief pitcher for the Philadelphia Phillies and the Texas Rangers. He also has a brother named Mark who lives in Rye, New York. His son, Austin, swam at the University of Texas and won the 200 individual medley and 200 backstroke at the 2010 Big 12 Championships. Then he won the 200 Individual Medley national title a month later.