| Sg | Pl | |
| Nom | landnámsmaðr | landnámsmenn (rule) |
| Acc | landnámsmann (rule) | landnámsmenn (rule) |
| Dat | landnámsmanni (rule) | landnámsmönnum (rule) |
| Gen | landnámsmanns (rule) | landnámsmanna (rule) |
| Sg | Pl | |
| Nom | landnámsmaðrinn (rule) | landnámsmennnir (rule) |
| Acc | landnámsmanninn (rule) | landnámsmennina (rule) |
| Dat | landnámsmanninum (rule) | landnámsmönnunum (rule) |
| Gen | landnámsmannsins (rule) | landnámsmannanna (rule) |