Πεῖρος
Could not find Πεῖρον in Logeion dictionaries.
Πεῖρον Proper-name noun masculine accusative singular of Πεῖρος
Πεῖρος — Peiros R. (Achaia), Pleiades 570572
Πεῖρος, ου (ὁ) Peiros, autre n. de l’Akhélôos, fl. d’Achaïe, Hdt. 1, 145, etc.