| Singular | Plural | |
|---|---|---|
| Nominativ | mergulus, mergulus | merguli, merguli |
| Genitiv | merguli, merguli | mergulorum, mergulorum, mergulum, mergulum |
| Dativ | mergulo, mergulo | mergulis, mergulis |
| Akkusativ | mergulom, mergulom, mergulum, mergulum | mergulos, mergulos |
| Ablativ | mergulo, mergulo | mergulis, mergulis |
| Vokativ | mergule, mergule | merguli, merguli |