| Sg | Pl | |
| Nom | brunnr | brunnar (rule) |
| Acc | brunn (rule) | brunna (rule) |
| Dat | brunni (rule) | brunnum (rule) |
| Gen | brunns (rule) | brunna (rule) |
| Sg | Pl | |
| Nom | brunnrinn (rule) | brunnarnir (rule) |
| Acc | brunninn (rule) | brunnana (rule) |
| Dat | brunninum (rule) | brunnunum (rule) |
| Gen | brunnsins (rule) | brunnanna (rule) |