| Sg. Indef. | fjarki |
| Sg. Def. | fjarkinn |
| Pl. Indef. | fjarkar |
| Pl. Def. | fjarkarnir |
| Sg. Indef. | fjarka |
| Sg. Def. | fjarkans |
| Pl. Indef. | fjarka |
| Pl. Def. | fjarkanna |
| Sg. Indef. | fjarka |
| Sg. Def. | fjarkanum |
| Pl. Indef. | fjörkum |
| Pl. Def. | fjörkunum |
| Sg. Indef. | fjarka |
| Sg. Def. | fjarkann |
| Pl. Indef. | fjarka |
| Pl. Def. | fjarkana |