| Sg | Pl | |
| Nom | slefa | slefur (rule) |
| Acc | slefu (rule) | slefur (rule) |
| Dat | slefu (rule) | slefum (rule) |
| Gen | slefu (rule) | slefna (rule) |
| Sg | Pl | |
| Nom | slefan (rule) | slefurnar (rule) |
| Acc | slefuna (rule) | slefurnar (rule) |
| Dat | slefunni (rule) | slefunum (rule) |
| Gen | slefunnar (rule) | slefnanna (rule) |