The name originates from Russian "Грива" (griva) which means ruff or mane. It is transliterated to "Griever" in English, which comes from "to grieve" - "to feel great sorrow".
Usage
See Special:Whatlinkshere/Etymology:Griever for a list of articles using this term.
This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.