Last names ending in -ин or -ов have the following forms. Note that the masculines are inflected like nouns, except for the Instrumental, which has an adjectival ending (-ым); the feminines and plurals are inflected like special adjectives.
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Masc.
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Fem.
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Plural
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Masc.
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Fem.
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Plural
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N.
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Ильќн
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Ильинђ
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ИльинІ
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Петрћв
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Петрћва
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Петрћвы
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A.
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Ильинђ
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Ильинџ
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ИльинІх
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Петрћва
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Петрћву
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Петрћвых
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G.
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"
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Ильинћй
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"
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"
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Петрћвой
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"
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P.
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Ильинљ
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"
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"
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Петрћве
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"
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"
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D.
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Ильинџ
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"
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ИльинІм
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Петрћву
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"
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Петрћвым
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I.
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ИльинІм
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"
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ИльинІми
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Петрћвым
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"
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Петрћвыми
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Recall that there are also names like Толстћй, Достољвский, etc., which are inflected like ordinary adjectives.
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