
Originally Posted by
Docm30
There is no feminine form of the word 'víkingr', as in a person who is a pirate, freebooter or viking, even when it's in reference to a female. The word 'víking', as in the act of piracy or a viking expedition, is a feminine word, though. The gender of words in Old Norse has very little to do with sex.
If you want to use the correct forms of the word 'víkingr' (person, not act) here's a quick guide:
Nominative: Víkingr, plural Víkingar.
Accusative: Víking, plural Víkinga
Dative: Víkingi, plural Víkingum
Genitive: Víkings, plural Víkinga
The definite forms (The Viking is definite in English. Old Norse uses a suffix instead of a word like 'the', though) are:
Nominative: Víkingrinn plural Víkingarnir.
Accusative: Víkinginn, plural Víkingana
Dative: Víkinginum, plural Víkingunum
Genitive: Víkingsins, plural Víkinganna
There's your quick guide on the declension of 1st type masculine nouns in Old Norse. If that looks complicated, be glad you've never had to conjugate verbs in Old Norse. Those are hell.