| Sg | Pl | |
| Nom | fjölkyngi | fjölkyngar (rule) |
| Acc | fjölkynga (rule) | fjölkynga (rule) |
| Dat | fjölkynga (rule) | fjölkyngum (rule) |
| Gen | fjölkynga (rule) | fjölkynga (rule) |
| Sg | Pl | |
| Nom | fjölkyngin (rule) | fjölkyngarnar (rule) |
| Acc | fjölkyngana (rule) | fjölkynganar (rule) |
| Dat | fjölkynganni (rule) | fjölkyngunum (rule) |
| Gen | fjölkyngannar (rule) | fjölkynganna (rule) |