| Sg | Pl | |
| Nom | múgr | múgar (rule) |
| Acc | múg (rule) | múga (rule) |
| Dat | múgi (rule) | múgum (rule) |
| Gen | múgs (rule) | múga (rule) |
| Sg | Pl | |
| Nom | múgrinn (rule) | múgarnir (rule) |
| Acc | múginn (rule) | múgana (rule) |
| Dat | múginum (rule) | múgunum (rule) |
| Gen | múgsins (rule) | múganna (rule) |