| Sg. Indef. | grindahvalur |
| Sg. Def. | grindahvalurin |
| Pl. Indef. | grindahvalir |
| Pl. Def. | grindahvalirnir |
| Sg. Indef. | grindahvals |
| Sg. Def. | grindahvalsins |
| Pl. Indef. | grindahvala |
| Pl. Def. | grindahvalanna |
| Sg. Indef. | grindahvali |
| Sg. Def. | grindahvalinum |
| Pl. Indef. | grindahvølum; grindahvalum |
| Pl. Def. | grindahvølunum; grindahvalunum |
| Sg. Indef. | grindahval |
| Sg. Def. | grindahvalin |
| Pl. Indef. | grindahvalir |
| Pl. Def. | grindahvalirnar |