In short

When you call someone or something by name in Ukrainian, you do not use the dictionary form. You use a special seventh case, the vocative (кли́чний відмі́нок), reserved for direct address. English lost this centuries ago (only “O Lord!” survives), but Ukrainian keeps it fully alive and uses it every single day: па́не (sir), Окса́но (Oksana!), дру́же (my friend!). If you address a person with the plain nominative, you sound like a machine reading a list, or even rude. Learn the vocative early: it is how you politely say “Excuse me…”, call your mother, or greet a colleague.

The rule

The vocative has its own endings, added to the noun’s stem instead of the nominative ending. Which ending you get depends on gender and stem type.

• Masculine (2nd declension) takes -е, -у or -ю:
  • hard stems usually take -е: бра́т -> бра́те, Іва́н -> Іва́не, па́н -> па́не;
  • a group of hard nouns (and endearments) takes -у: си́н -> си́ну, това́риш -> това́ришу, ба́тько -> ба́тьку;
  • soft stems take -ю: Андрі́й -> Андрі́ю, учи́тель -> учи́телю, І́гор -> І́горю.
• Feminine (1st declension) takes -о or -е / -ю:
  • hard stems take -о: ма́ма -> ма́мо, Окса́на -> Окса́но, сестра́ -> се́стро;
  • soft stems take -е: Марі́я -> Марі́є, Наді́я -> Наді́є, земля́ -> зе́мле;
  • endearing/soft-suffix nouns take -ю: мату́ся -> мату́сю, бабу́ся -> бабу́сю.
• Feminine (3rd declension), like любо́в, ра́дість, takes -е: любо́в -> любо́ве, ра́дість -> ра́досте.
• Neuter nouns and all plurals have no separate vocative — reuse the nominative: се́рце!, Дру́зі!, Ді́ти!, Па́ні та пано́ве!

Two things to watch. First, before the ending -е, a final г, к, х or ц often swaps to ж, ч, ш / ч: дру́г -> дру́же, коза́к -> коза́че, хло́пець -> хло́пче. Second, when you address someone by title + name, both words go into the vocative: па́не профе́соре, па́ні Окса́но.

Forms & patterns

Masculine nouns (2nd declension):

Feminine nouns (1st declension):

Endearing forms of address (здрібні́лі фо́рми зверта́ння) — the warm, everyday “pet” way to call family. They are formed with diminutive suffixes and still take a real vocative ending:

Examples

Common mistakes

• Окса́на, приві́т! -> Окса́но, приві́т! — a name used to call someone must take the vocative, not stay in the nominative.
• Мій друг, допоможи́! -> Дру́же, допоможи́! — direct address needs the vocative дру́же (with г -> ж), not the dictionary form друг.
• Приві́т, ма́ма! -> Приві́т, ма́мо! — feminine hard nouns in -а become -о in the vocative.
• Дя́кую, пан! -> Дя́кую, па́не! — a polite address to a man uses па́не, never the bare nominative пан.
• Сино́к, іди́ сюди́! -> Синку́, іди́ сюди́! — an endearment still needs its own vocative ending (-у), it is not “already” a form of address.
• Пане Оксана -> Па́ні Окса́но — with a title + name, both words go into the vocative (and the feminine of пан is па́ні, which keeps the same form in the vocative).

Tips

• Ukrainian keeps a full, everyday vocative (Russian, by contrast, has lost it) — you will hear it constantly, so treat it as a real seventh case, not a museum piece.
• Memorise the four default endings: masculine hard -> -е (бра́те), masculine soft -> -ю (Андрі́ю), feminine -а -> -о (ма́мо), feminine soft/endearing -> -е / -ю (Наді́є, мату́сю).
• Watch the consonant swap before -е: к/г/х/ц soften to ч/ж/ш/ч (друг -> дру́же, коза́к -> коза́че, хло́пець -> хло́пче).
• Endearments have their own vocative too: синку́, до́нечко, мату́сю, діду́сю — say them with -у/-о/-ю, do not leave them in the plain form.
• Plurals need nothing new: to address a group, just reuse the nominative plural — Дру́зі!, Ді́ти!, Па́ні та пано́ве!
• Stress can jump when you form the vocative (Петро́ -> Пе́тре, сестра́ -> се́стро): learn the whole pair, not only the ending.
• Default to polite ви with strangers, and pair it with па́не / па́ні + the vocative for a natural, respectful “Excuse me…”.