Etymology

Monday

Mon·day
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Today it means: The second day of the week in many religious traditions, and the first day of the week in systems using the ISO 8601 norm. It follows Sunday and precedes Tuesday. Full definition →

Middle English Monday ← Old English mōnandæġ ← Proto-West Germanic *mānini dag
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The story

  1. Latin · derived fromdiēs Lūnae
  2. Proto-West Germanic · inherited from*mānini dag
  3. Old English · inherited frommōnandæġ“day of the moon”
  4. Middle English · inherited fromMonday
  5. English todayMonday

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 moandag (“Monday”), Yiddish מאָנטיק (montik, “Monday”), Danish, Norwegian Bokmål mandag (“Monday”), Faroese mánadagur (“Monday”), Icelandic mánudagur (“Monday”), Norwegian Nynorsk, Swedish måndag (“Monday”), Finnish maanantai (“Monday”).

Etymology from Wiktionary, CC BY-SA 4.0.