Thursday

Painting depicting the Norse god Thunor (the Norse Thor), after whom Thursday is named, by Mårten Eskil Winge, 1872
The name is derived from Old English þunresdæg and Middle English Thuresday (with loss of -n-, first in northern dialects, from influence of Old Norse Þórsdagr) meaning “Thor’s Day”. It was named after the Norse god of Thunder, Thor. Thunor, Donar (German, Donnerstag) and Thor are derived from the name of the Germanic god of thunder, Thunraz, equivalent to Jupiter in the interpretatio romana.

https://en.wikipedia.org/wiki/Thursday