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For men:
-ovich added to the father's first name if it (father's first name) ends in a consonant
-evich added to the father's first name if it ends in a vowel

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i.e. Feodor's son would be Feodorovich, Evgeni's son would be Evgenievich

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For women
-ovna added to the father's first name if it (father's first name) ends in a consonant
-evna added to the father's first name if it ends in a vowel

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i.e. Feodorovna, but Evgenievna