The story
- Proto-West Germanic · inherited from*mānalīk“pertaining to the moon, moon-like”
- Old English · inherited frommōnlīċ“lunar”
- Middle English · inherited frommonelich
- English todaymoonly
From Middle English monelich, from Old English mōnlīċ (“lunar”), from Proto-West Germanic *mānalīk (“pertaining to the moon, moon-like”), equivalent to moon + -ly. Cognate with Middle Dutch maenlijc (“moonly, lunar”), German mondlich (“lunar”).
Etymology from Wiktionary, CC BY-SA 4.0.