| Sg | Pl | |
| Nom | hjarta | hjörtu (rule) |
| Acc | hjarta (rule) | hjörtu (rule) |
| Dat | hjarta (rule) | hjörtum (rule) |
| Gen | hjarta (rule) | hjartna (rule) |
| Sg | Pl | |
| Nom | hjartat (rule) | hjörtun (rule) |
| Acc | hjartat (rule) | hjörtun (rule) |
| Dat | hjartanu (rule) | hjörtunum (rule) |
| Gen | hjartans (rule) | hjartnanna (rule) |