| Sg | Pl | |
| Nom | félagi | félagar (rule) |
| Acc | félaga (rule) | félaga (rule) |
| Dat | félaga (rule) | félugum (rule) |
| Gen | félaga (rule) | félaga (rule) |
| Sg | Pl | |
| Nom | félaginn (rule) | félagarnir (rule) |
| Acc | félagann (rule) | félagana (rule) |
| Dat | félaganum (rule) | félugunum (rule) |
| Gen | félagans (rule) | félaganna (rule) |