| Sg | Pl | |
| Nom | arfr | arfar (rule) |
| Acc | arf (rule) | arfa (rule) |
| Dat | arfi (rule) | örfum (rule) |
| Gen | arfs (rule) | arfa (rule) |
| Sg | Pl | |
| Nom | arfrinn (rule) | arfarnir (rule) |
| Acc | arfinn (rule) | arfana (rule) |
| Dat | arfinum (rule) | örfunum (rule) |
| Gen | arfsins (rule) | arfanna (rule) |