Ellis - I watched the WWII film "Black Book", which tells the story of Rachel Stein who, in order to survive, starts working for the Dutch resistance under the name of Ellis de Vries. I can't find any information on the name's use among the Dutch but I think it's really lovely.
Mahershalalhashbaz and Amatus - I recently watched a clip of actor Mahershala Ali on Jimmy Kimmel talking about the baby he's expecting, and how they want something unique, but maybe not as unusual as their names. They talk some about his name, and how Mahershala is actually a nickname - his full name is Mahershalalhashbaz, the longest word in the Bible and the name of the prophet Isaiah's son. It means "hurry to the spoils!". His wife's name is Amatus - which means "beloved" in Latin, and was the name of a 7th-century (male) saint.