 Larrazabal's father is Aitor Larrazábal, who made over 400 appearances for Athletic Bilbao as a defender between 1990 and 2004 and later became a manager, and whose goal celebrations included producing a pacifier from his shorts to represent his baby sons.They met as opponents when Gaizka was playing for Zamudio and Aitor in charge of SD Amorebieta, and again when Bilbao Athletic faced Barakaldo CF.In 2002, Aitor lined up in the same Athletic Bilbao team as Aritz Aduriz, who was also on the field for Gaizka's debut for the club nearly 17 years later.