originates from

PNWGmc *mānô 'moon' (mānô > mānō > mą̄nō > mą̄nā > mōnā > mōna) through pnwgmc-to-oe

PGmc *mēnan- 'moon' (mēnan- > mānan > mą̄nan > mōnan) through pgmc-to-oe