Greip

1. a "Billow Maiden"
2. Geirröd's daughter

1.
According to the Poetic Edda, Greip ("Griper") was, by Odin, one of Heimdall's nine mothers ("The Billow Maidens").

She was the daughter of the sea god (giant) Aegir and Ran.

Poetic Edda: Hyndluljoth - The Poem of Hyndla

2.
Another "Greip" was a daughter of the giant Geirröd. She and her sister Gjalp tryed to kill Thor.