As a Bulgarian here, definitely the surname won't become suddenly "Draganova" (which is for women only ending) it will stay the same for the males, as for women it might change to the male ending, like we have the actress from The Vampire Diaries in the US : Nina Dobrev ( in Bulgarian would have been "Dobreva") . And one more specific, Bulgarians have 3 names per official documents : Your own name, Father's name and Surname It won't make sense to present yourself with first name and father's name (which is always in the middle). "Draganova" is her last name as in the other courtiers for example in UK ( as where is is living ) they won't be bothered with the father's name, no one will ask for it.The ending -ovA indicates usually a female person. Like Polish or Russian names. The thing is, when they immigrate into a non-slavic country, the names get often adjusted. Like for a Polish name the ending -ovska goes to the plural -ovski. And Draganova would most propably become Draganov. A friend of mine is from Bulgaria and has also a name ending on -ova. She kept that, but her she married and her sons have the surname of the father. Otherwise would be very odd, I guess.
Or Jelzina -> Jelzin etc.
TL;DR: it's odd for a male person (Ivan) having a female ending in last name, but could be because of immigration.
Also, in case of Maria, Draganova could be her father's name, maybe his name is Dragan. So it's not her last name.
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