| Sg | Pl | |
| Nom | aptann | aptanar (rule) |
| Acc | aptan (rule) | aptana (rule) |
| Dat | aptani (rule) | öptunum (rule) |
| Gen | aptans (rule) | aptana (rule) |
| Sg | Pl | |
| Nom | aptanninn (rule) | aptanarnir (rule) |
| Acc | aptaninn (rule) | aptanana (rule) |
| Dat | aptaninum (rule) | öptununum (rule) |
| Gen | aptansins (rule) | aptananna (rule) |