Etymology

Sunday

Sun·day
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Today it means: The first day of the week in many religious traditions, and the seventh day of the week in systems using the ISO 8601 standard; the Christian Sabbath; it follows Saturday and precedes Monday. Full definition →

Middle English Sonday ← Old English sunnandæġ ← Proto-West Germanic *Sunnōn dag
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The story

  1. Latin · derived fromdiēs Sōlis
  2. Proto-West Germanic · inherited from*Sunnōn dag
  3. Old English · inherited fromsunnandæġ
  4. Middle English · inherited fromSonday
  5. English todaySunday

From Middle English Sonday, from Old English sunnandæġ, from Proto-West Germanic *Sunnōn dag (literally “day of the Sun”), equivalent to sun + day, as a calque (interpretātiō germānica) of Latin diēs Sōlis; declared the "venerable day of the sun" by Roman Emperor Constantine on March 7, 321 C.E. Compare Saterland Frisian Sundai (“Sunday”), German Low German Sünndag, Dutch zondag, West Frisian snein, German Sonntag, Danish søndag, Yiddish זונטיק (zuntik).

Etymology from Wiktionary, CC BY-SA 4.0.