| Sg. Indef. | gráhvalur |
| Sg. Def. | gráhvalurinn |
| Pl. Indef. | gráhvalir |
| Pl. Def. | gráhvalirnir |
| Sg. Indef. | gráhvals |
| Sg. Def. | gráhvalsins |
| Pl. Indef. | gráhvala |
| Pl. Def. | gráhvalanna |
| Sg. Indef. | gráhval |
| Sg. Def. | gráhvalnum |
| Pl. Indef. | gráhvölum |
| Pl. Def. | gráhvölunum |
| Sg. Indef. | gráhval |
| Sg. Def. | gráhvalinn |
| Pl. Indef. | gráhvali |
| Pl. Def. | gráhvalina |