Where does “Antonoff” come from?

Antonoff (Portuguese) comes from Bulgarian Антонов, from Russian -о́в, from Old East Slavic -овъ, from Proto-Slavic -ovъ — of, belonging to.

Ancestry of “Antonoff”, step by step

Antonoff traces back through two separate lines of ancestry.

via Bulgarian Антонов

StepLanguageWordMeaning
1BulgarianАнтонов
2Russian-о́вGenitive plural desinence of most hard-stem masculine nouns
3Old East Slavic-овъ
4Proto-Slavic-ovъof, belonging to

via Russian Анто́нов

StepLanguageWordMeaning
1RussianАнто́новAnton's, Anthony's
Every word from Proto-Slavic -ovъEvery word from Russian -о́вEvery word from Old East Slavic -овъ