| Sg | Pl | |
| Nom | hreystimaðr | hreystimenn (rule) |
| Acc | hreystimann (rule) | hreystimenn (rule) |
| Dat | hreystimanni (rule) | hreystimönnum (rule) |
| Gen | hreystimanns (rule) | hreystimanna (rule) |
| Sg | Pl | |
| Nom | hreystimaðrinn (rule) | hreystimennnir (rule) |
| Acc | hreystimanninn (rule) | hreystimennina (rule) |
| Dat | hreystimanninum (rule) | hreystimönnunum (rule) |
| Gen | hreystimannsins (rule) | hreystimannanna (rule) |