Gender masculine Θανάσος is a augmentative form of Greek name Θανάσης.Feasts and saints related to given name Θανάσος Sts Athanase et Cyrille, Patriarches d'Alexandrie Feast day January 18 When is Θανάσος's name day? Θανάσος's Day is celebrated on January 18 in memory of Sts Athanase et Cyrille. Variantes et traductions Νάσος(el) Transcriptions Thanassos(la) Log in or register to post comments Be the first to rate this name Leave this field blank