Gender masculine Γιαννάκης is a diminutive form of Greek name Γιάννης.Feasts and saints related to given name Γιαννάκης Synaxis of Prophet Forerunner and Baptist John Feast day January 7 When is Γιαννάκης's name day? Γιαννάκης's Day is celebrated on January 7 in memory of Synaxis of Prophet Forerunner and Baptist John. Transcriptions Giannakis (la) Log in or register to post comments Be the first to rate this name Leave this field blank