Most likely from German Herzog.
hertsog (genitive hertsogi, partitive hertsogit)
| Declension of hertsog (ÕS type 2/õpik, no gradation) | |||
|---|---|---|---|
| singular | plural | ||
| nominative | hertsog | hertsogid | |
| accusative | nom. | ||
| gen. | hertsogi | ||
| genitive | hertsogite | ||
| partitive | hertsogit | hertsogeid | |
| illative | hertsogisse | hertsogitesse hertsogeisse | |
| inessive | hertsogis | hertsogites hertsogeis | |
| elative | hertsogist | hertsogitest hertsogeist | |
| allative | hertsogile | hertsogitele hertsogeile | |
| adessive | hertsogil | hertsogitel hertsogeil | |
| ablative | hertsogilt | hertsogitelt hertsogeilt | |
| translative | hertsogiks | hertsogiteks hertsogeiks | |
| terminative | hertsogini | hertsogiteni | |
| essive | hertsogina | hertsogitena | |
| abessive | hertsogita | hertsogiteta | |
| comitative | hertsogiga | hertsogitega | |