| Sg | Pl | |
| Nom | rún | rúnar (rule) |
| Acc | rún (rule) | rúnar (rule) |
| Dat | rún (rule) | rúnum (rule) |
| Gen | rúnar (rule) | rúna (rule) |
| Sg | Pl | |
| Nom | rúnin (rule) | rúnarnar (rule) |
| Acc | rúnina (rule) | rúnarnar (rule) |
| Dat | rúninni (rule) | rúnunum (rule) |
| Gen | rúnarinnar (rule) | rúnanna (rule) |