: the name Midgard, which perhaps relates to Myrgard.
"Midgard" means the "Middle Garden" or "Middle Land" or "Middle Earth." The lattest is what Tolkien used in LotR. "Myrgard" means the "Garden" or "Land of Myr"
whatever "myr" means. It's a prefix that's everywhere in old myths and the game of Myth: Myrkvith, Myrkwood, Myrkridia, Myrdred, Myrmidons, etcetera. "Myrkvith" is a thick, dark forest that is barely penetrable. The LotR equivalent is "Myrkwood." The prefix of "myrk", from Old Norse, means "dark." This certainly makes the name "Myrkridia" understandable; "Dark Ridia", whatever "Ridia" are. As for just "myr," no idea, but I'm guessing it's something positive based on the fact a great city was named after it and an Avatara of the Age of Light had the name too.
Oh, and about Ephors (not Eddas); they're from Greece, a governer-like ruler of a city-state.
1 : one of five ancient Spartan magistrates having power over the king
2 : a government official in modern Greece; especially : one who oversees public works
