Roman cognomen
Roman cognomen (derived in popular etymology from pisere, 'trample', Plin. HN 18,10), hereditary within the family of the Calpurnii (Calpurnius [I 8-23; II 12-24]) and transferred to the Pupii (Pupius); in many other families in the Imperial Period. Also the name of an Aquitanian prince who fell fighting for Caesar in 55 BC (Caes. B Gall. 4,12,3-6); his father or grandfather may have taken the name from L. Calpurnius [I 17] P. (cos. 112 BC).