Where does “Антонівна” come from?

Антонівна (Ukrainian) comes from Ukrainian -і́вна, from Ukrainian -на, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

Ancestry of “Антонівна”, step by step

StepLanguageWordMeaning
1Ukrainian-і́внаA feminine patronymic suffix added to a given name: daughter of
2Ukrainian-на(or) A feminine patronymic suffix added to a given name: daughter or wife of
3Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъ →Every word from Ukrainian -і́вна →Every word from Ukrainian -на →