Probably from the same as polemos, or perhaps from polus; a town (properly, with walls, of greater or less size) -- city.
see GREEK polus
see GREEK polemos
πόλει (polei) − 21 Occurrences
πόλεις (poleis) − 12 Occurrences
πόλεσιν (polesin) − 2 Occurrences
πόλεων (poleōn) − 6 Occurrences
πόλεως (poleōs) − 36 Occurrences
πόλιν (polin) − 64 Occurrences
πόλις (polis) − 22 Occurrences