What are the origins of the name 'Malekith'?

According to Norse Mythology, the Elves were inhabitants of Aelfar, which was ruled by Freyr. They were given to Freyr in payment for losing a tooth, as referenced by one of the Eddas. Other than a couple of names of leaders, there isn't much actual Norse mythology built around the elves, much of that came later.

The dwarves were said to be formed from maggots that ate from the giant Ymir, and the first two were Durin and Modsognir. One early descendant is named Lofar, and part of his lineage is Dvalin, who is a leader of the dwarves.

One race of dwarves is known as svaltarfar, or "black elves". Additionally, one character in the folklore is named Volund (From the eddaic Volundarkvida), or Wayland in English, and is known as Lord of the Elves, but he was a master smith/craftsman, which is more attributed to the dwarven races.

TL;DR

I would postulate that Malekith is a made up name, as the "th" sound and combination of letters is actually very rare in Old Norse naming conventions. Even "Thor" is more an Anglicization pronunciation than the actual original spelling. Frith is more accurately Fnor in Old Norse, etc.

As far as the etiology, Male = male, kith = familiar, friends. It may also be an adaptation of Malachi, or Mal'akhi (Old Hebrew) who was one of the twelve minor prophets of the Old Testament.

Malekith is not from Male but Maleficum = Crime, something bad and Kith means friendship, relation also knowledge. Malekith is a man related to crime. A bad friend. And this is what he does, he sacrifices his friend and his whole race.

In my language (Italian, which is probably the closest to Latin) Malekith sounds like evil, and there is no other possible meaning.

Another example: in the old TV series Ghostbusters, the villain Prime Evil has been translated as Malefix, which sounds very similar to Malekith.

As an aside, even though the name is fictional "th" is actually common in Old Norse, despite the claims of a previous poster who is probably thinking of modern Nordic languages in Scandinavia (though not for instance Iceland which still features the sound). Thor was in fact pronounced much like the Modern Standard English form albeit with a pronounced "r" unlike most forms of English outside North America. Odin was likewise Óðinn and a better anglicisation would probably be Othinn rather than Odin, the "ð" being a "th" sound and not a "d".

If Malekith was a Norse name I'd guess it would have to mean something like "young goat who grinds" or "grinding-kid" with the elements "mala" ("grinds, purrs") and "kið" ("kid", in the sense of "juvenile goat").

As has been said I think the Marvel comic Malekith is the older of the two but it is unknown how intentional it was for Games Workshop to copy Marvel. Did they think it was a Norse Mythological name? Was it subconcious? Who knows?

Just to sum it up:

The Marvel Malekith has first appeared in 1984 in Thor #344. The Warhammer Malekith was first mentioned in the High Elves Army book in 1992, but he wasn't fully fleshed until 1995, when the Dark Elves Army book came out.

As previously mentioned, his name is composed from the latin/spanish "Mal" - bad, evil; and old English/Germanic "kith" - friends, relations.

But anecdotal evidence suggests that Walt Simmons - the author of the Marvel's Malekith - knew only about the first part of the word (Mal) and just wanted to add something "cool in celtic".

Source: Metafilter

I’ve been investigating and found two options.

1. The dark elves, in norse mythology are called Svartálfar or Myrkálfar (the pronunciation in icelandic being something like “Mishkalath”, that means “dark calf”).
2. Moloch, the biblical name of a deity asociated with child sacrifices. The interesting thing here is that “Moloch” in hebrew is pronounced “malaj”, that means “king”. Related to the word “malaj” is “malejt” in hebrew, which means “you ruled”.

I believe it is a deformation of this words or the pronunciation of them in english.

I think that also in some languages maleika or malaika ( I'm not sure about the spelling) means angel. Maybe Malekith means dark angel. The -ith sounds like Sith to me, there must be a relationship of some kind given that both the Sith and the dark elves are dark beings, so it might mean Friend of evil or something.