| Singular | Plural | |
|---|---|---|
| Nominativ | merga, merga | mergae, mergae |
| Genitiv | mergai, mergae, mergai, mergae | mercum, mergarum, mergum, mergarum |
| Dativ | mergae, mergai, mergae, mergai | mercis, mergabus, mergis, mergabus |
| Akkusativ | mergam, mergam | mergas, mergas |
| Ablativ | merga, mergad, merga, mergad | mercis, mergabus, mergis, mergabus |
| Vokativ | merga, merga | mergae, mergae |