Probably from meno; remaining, i.e. Sole or single; by implication, mere -- alone, only, by themselves.
see GREEK meno
μόνα (mona) − 1 Occurrence
μόνας (monas) − 2 Occurrences
μόνην (monēn) − 2 Occurrences
μόνοι (monoi) − 4 Occurrences
μόνοις (monois) − 1 Occurrence
μόνος (monos) − 20 Occurrences
μόνου (monou) − 2 Occurrences
μόνους (monous) − 3 Occurrences
μόνῳ (monō) − 7 Occurrences