Vocative: Иване, мамо, господине

Bulgarian has no case endings for nouns, but it keeps a special form for calling or addressing someone: the vocative.

• Most masculine names and nouns ending in a consonant add -е: Иван → Иване, шеф → шефе, господин → господине, доктор → докторе. Before -е, к becomes ч and г becomes ж: човек → човече, Бог → Боже. Names in -ър drop the ъ: Петър → Петре; -й is replaced: Николай → Николае.
• Nouns in -тел, -ар and a few others take -ю: приятел → приятелю, учител → учителю, цар → царю.
• Feminine nouns in -а/-я take -о: мама → мамо, госпожа → госпожо, леля → лельо; -ица becomes -ице: госпожица → госпожице.

Names ending in a vowel (Никола, Христо, Георги) and foreign names do not change. Vocatives of women's names (Марийо) sound rustic, so simply say Мария.