From Wiktionary, the free dictionary
From var (“cautious”) (vör in the nominative feminine singular).
-vör f (proper noun-forming suffix, proper noun, genitive singular -varar)
- suffix forming female given names
- gunnur (“battle”) + -vör → Gunnvör
- her (“army”) + -vör → Hervör
- Þór (“Thor”) + -vör → Þórvör
Declension of -vör (sg-only feminine)