| Sg. Indef. | hatrikk |
| Sg. Def. | hatrikkið |
| Pl. Indef. | hatrikk |
| Pl. Def. | hatrikkini |
| Sg. Indef. | hatriks |
| Sg. Def. | hatriksins |
| Pl. Indef. | hatrikka |
| Pl. Def. | hatrikkanna |
| Sg. Indef. | hatrikki |
| Sg. Def. | hatrikkinum |
| Pl. Indef. | hatrikkum |
| Pl. Def. | hatrikkunum |
| Sg. Indef. | hatrikk |
| Sg. Def. | hatrikkið |
| Pl. Indef. | hatrikk |
| Pl. Def. | hatrikkini |