Thursday is named for Thor, Norse god of Thunder. Thor is the most popular Norse god of all. He originally became popular because he did not demand human sacrifices like many other gods, but his popularity continues even to this day.
During a thunderstorm, Thor rides through the heavens on his chariot pulled by the goats Tanngrisni ("gap-tooth") and Tanngnost ("tooth grinder"). He wields his hammer, Mjollnir, causing great flashes of lightning. He also wears a belt, Megingjard, which doubles his strength. At the day of Ragnarok, Thor will kill his greatest enemy, the serpent Jormungand, but he will die from its poison. His sons will inherit his hammer.