| Sg | Pl | |
| Nom | armr | armar (rule) |
| Acc | arm (rule) | arma (rule) |
| Dat | armi (rule) | örmum (rule) |
| Gen | arms (rule) | arma (rule) |
| Sg | Pl | |
| Nom | armrinn (rule) | armarnir (rule) |
| Acc | arminn (rule) | armana (rule) |
| Dat | arminum (rule) | örmunum (rule) |
| Gen | armsins (rule) | armanna (rule) |