| Sg | Pl | |
| Nom | arfi | arfar (rule) |
| Acc | arfa (rule) | arfa (rule) |
| Dat | arfa (rule) | örfum (rule) |
| Gen | arfa (rule) | arfa (rule) |
| Sg | Pl | |
| Nom | arfinn (rule) | arfarnir (rule) |
| Acc | arfann (rule) | arfana (rule) |
| Dat | arfanum (rule) | örfunum (rule) |
| Gen | arfans (rule) | arfanna (rule) |