i. e. "sharp" (pennum antiqui acutum dicebant, Isid. Orig. 19.19), was a family-name in the Junia and Quinctia gentes. In the latter gens it always occurs with other surnames, under which the Quinctii with this cognomen are given [CAPITOLINUS, QUINCTUS, Nos. 7, 8, 9 ; CINCINNATUS, No. 3] : the Penni of the Junia gens are given below.