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Re: Mitrofanov(a)
A patronymic, as you suggest, from a forename of Greek origin. Russians were discouraged by the Orthodox clergy from giving their children Slavic names, Greek names being preferred. I think that this surname could be Russian in origin rather than Ukrainian, but that's just an opinion.https://en.wikipedia.org/wiki/Mitrofan
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That is possible, I said she was Ukrainian but there seems to be a lot of Russian people with surnames ending in ko, which are always Ukrainian.
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Ukrainian nationality and Russian ethnicity is a common combination. The Ukrainian equivalent of the Russian -ov surname ending is -iv. But, as you point out, -ko is a common ending, particularly in the form -enko, which is very common. -chuk is another common Ukrainian surname ending.
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https://en.wikipedia.org/wiki/Mitrofan
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