| Sg. Indef. | heiði |
| Sg. Def. | heiðin |
| Pl. Indef. | heiðar |
| Pl. Def. | heiðarnar |
| Sg. Indef. | heiðar |
| Sg. Def. | heiðarinnar |
| Pl. Indef. | heiða |
| Pl. Def. | heiðanna |
| Sg. Indef. | heiði |
| Sg. Def. | heiðinni |
| Pl. Indef. | heiðum |
| Pl. Def. | heiðunum |
| Sg. Indef. | heiði |
| Sg. Def. | heiðina |
| Pl. Indef. | heiðar |
| Pl. Def. | heiðarnar |