From Wiktionary, the free dictionary
From laug (“pool; hot spring”).
-laug f (proper noun-forming suffix, proper noun, genitive singular -laugar)
- suffix forming female given names
- geir (“spear”) + -laug → Geirlaug
- sigur (“victory”) + -laug → Sigurlaug
- ís (“ice”) + -laug → Íslaug
Declension of -laug (sg-only feminine)