Etymology
From Middle English Monday, Monenday, from Old English mōnandæġ (“day of the moon”), from Proto-West Germanic *mānini dag, a calque (interpretātiō germānica) of Latin diēs Lūnae, equivalent to Moon + day. See also Japanese 月曜日 (“Moon's day”).
Cognates
Compare Scots Monanday (“Monday”), Yola Mondei (“Monday”), Saterland Frisian Moundai (“Monday”), West Frisian moandei (“Monday”), Alemannic German meintog, miantag, méntag, mìntàg, mäntag, Määntig (“Monday”), Bavarian Monda, Mondåg, montach, monti (“Monday”), Cimbrian matak, menta, méentag (“Monday”), Dutch maandag (“Monday”), German Montag (“Monday”), German Low German Maandag (“Monday”), Luxembourgish Méindeg (“Monday”), Mòcheno ma'ta (“Monday”), Pennsylvania German Mundaag, Muundaag (“Monday”), Vilamovian möntaog (“Monday”), West Flemish m