| Singular | Plural | |
|---|---|---|
| Nominativ | commers | commerces, commercis |
| Genitiv | commercis | commercium, commercum |
| Dativ | commerci, commerce | commercibus |
| Akkusativ | commercem, commercim | commerces, commercis, commerceis |
| Ablativ | commerci, commerce | commercibus |
| Vokativ | commers | commerces |