Do the names of some elements have anything to do with planets?
Neptunium (93) and plutonium (94) were so named because they followed uranium (92) on the periodic table.

Uranium was named after Uranus. German chemist Martin Heinrich Klaproth discovered uranium in 1789, eight years after William Herschel discovered Uranus. At the time, uranium was the densest element known and Uranus was the farthest planet from the sun known.