Sunday (n.)
first day of the week, Old English sunnandæg (Northumbrian sunnadæg), literally "day of the sun," from sunnan, oblique case of sunne "sun" (see sun (n.)) + dæg "day" (see day). A Germanic loan-translation of Latin dies solis "day of the sun," which is itself a loan-translation of Greek hēmera heliou. Compare Old Saxon sunnun dag, Old Frisian sunnandei, Old Norse sunnundagr, Dutch zondag, German Sonntag "Sunday."
The Norwegian word for sun is “sol,” and there was a Norse goddess with this name. She was the sister of Mani, and the gods did not like that she was named after the sun either, so she had to pull it across the sky for eternity.