| Sg | Pl | |
| Nom | Hrímþursr | Hrímþursar (rule) |
| Acc | Hrímþurs (rule) | Hrímþursa (rule) |
| Dat | Hrímþursi (rule) | Hrímþursum (rule) |
| Gen | Hrímþurss (rule) | Hrímþursa (rule) |
| Sg | Pl | |
| Nom | Hrímþursrinn (rule) | Hrímþursarnir (rule) |
| Acc | Hrímþursinn (rule) | Hrímþursana (rule) |
| Dat | Hrímþursinum (rule) | Hrímþursunum (rule) |
| Gen | Hrímþurssins (rule) | Hrímþursanna (rule) |