| Sg | Pl | |
| Nom | vetr | vetrar (rule) |
| Acc | vetr (rule) | vetra (rule) |
| Dat | vetri (rule) | vetrum (rule) |
| Gen | vetrar (rule) | vetra (rule) |
| Sg | Pl | |
| Nom | vetrinn (rule) | vetrarnir (rule) |
| Acc | vetrinn (rule) | vetrana (rule) |
| Dat | vetrinum (rule) | vetrunum (rule) |
| Gen | vetrarins (rule) | vetranna (rule) |