Thursday is derived from Old English þunresdæg influenced by Old Norse Þórsdagr meaning “Thor’s Day”, named after the Norse god of thunder, lightning.
In Germany, Donnerstag ‘Thunder Day’ (Notice a trend of the Germans discarding their Norse history, even in the names of many of their days? That’s due to the influence of the Church when all the tribes were being converted to Christianity)
In many other European countries that were part of the Roman empire, variations in Iovis Dies, “Jupiter’s Day” are found in Italian giovedì , Spanish jueves , French jeudi , and Romanian  jo