The Giants- M

Hail!

I'm moving onto the M's. I got this info from Wikipedia, which isn't the best source but they did a good job here.

M

Mánagarm

The wolf that will swallow the moon during Ragnarök.

Mimir

Mímir (Old Norse "The rememberer, the wise one")^[1] or Mim is a figure in Norse mythology renowned for his knowledge and wisdom who is beheaded during the Æsir-Vanir War. Afterward, the god Odin carries around Mímir's head and it recites secret knowledge and counsel to him.
Mímir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, the Prose Edda, written in the 13th century by Snorri Sturluson of Iceland, and in euhemerized form as one of the Æsir in Heimskringla, also written by Snorri Sturluson in the 13th century. Mímir's name appears in the names of the well Mímisbrunnr, the tree Mímameiðr, and the wood Hoddmímis holt.

He's also over a well that bares his name, which Odin sacrifices his eye to gain wisdom.

Modgudr

In Norse mythology, Móðguðr (Modgud, "Furious Battler") refers to the female guardian of the bridge over the river Gjöll ("Noisy"), Gjallarbrú. She allowed the newly dead to use the bridge to cross from one side of the river Gjöll to the other if the soul stated his or her name and business, and possibly in turn prevented the dead beyond the river from crossing back over Gjöll into the lands of the living.

Mogprasir

In Norse mythology, Mögþrasir (Old Norse, possibly meaning "the one who is striving for sons"^[1]) is a jötunn who is solely attested in stanza 49 of the poem Vafþrúðnismál from the Poetic Edda.

 Mokkurkalfi

Another name for Hrungnir.