Ymir

Ymir (ē`mĕr), in Norse mythology, primeval giant and progenitor of a race of giants. Odin and his brothers slew Ymir; from his skull they fashioned the sky, from his flesh the earth, from his bones the mountains, and from his blood the sea.

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Aurgelmir

 or Ymir

In Norse mythology, the first being, a giant created from the drops of water that formed when the ice of Niflheim met the heat of Muspelheim. He was the father of all giants; a male and female grew under his arm and his legs produced a six-headed son, whom the cow Audumla nursed. Audumla licked salty frost from stones, which she shaped into the man Buri, grandfather of Odin and his brothers. The gods killed Aurgelmir and put his body into the void, where his flesh became the earth, his blood the seas, his bones mountains, his teeth stones, his skull the sky, and his brains the clouds. His eyelashes (or eyebrows) became the fence around Midgard, home of mankind.

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Ymir

father of the giant race. [Norse Myth.: Wheeler, 395]

See : Giantism