| Sg | Pl | |
| Nom | steinn | steinar (rule) |
| Acc | stein (rule) | steina (rule) |
| Dat | Steini (rule) | steinum (rule) |
| Gen | Steins (rule) | steina (rule) |
| Sg | Pl | |
| Nom | steinninn (rule) | steinarnir (rule) |
| Acc | steininn (rule) | steinana (rule) |
| Dat | Steininum (rule) | steinunum (rule) |
| Gen | Steinsins (rule) | steinanna (rule) |