Cognomen Фирсов (Фирсов 
, Firsov 
, Firsow 
) , in the entire world, is a common family name. The family name Фирсов is characteristic of Russia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
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| Фирсов | Russia, Kazakhstan, Poland, Ukraine, Belarus |
| Firsov | Russia, Lithuania, Estonia, United States, Romania |
| Firsow | Brazil, Chile, Germany, Poland, United States |
| фирсов, иван иванович Russian painter (1733-1785), RU (b. 1733) |
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фирсов, николай николаевич Russian writer, RU (b. 1839) |
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николай фирсов RU (b. 1864) |
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| фирсов, николай алексеевич RU (b. 1831) |
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фирсов, афанасий осипович UA (b. 1883) |
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фирсов, олег борисович Russian physicist, RU (b. 1915) |
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фирсов, борис максимович Russian sociologist, RU (b. 1929) |
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фирсов, анатолий васильевич ice hockey player (1941-2000), RU (b. 1941) |
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фирсов, герман иванович RU (b. 1936) |
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фирсов, владимир руфинович Russian library scientist, RU (b. 1952) |
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| фирсов, павел андреевич RU (b. 1901) |
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| фирсов, георгий гаврилович BY (b. 1902) |
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| фирсов, василий никифорович RU (b. 1903) |
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| фирсов, илья петрович RU (b. 1905) |
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| фирсов, иван иванович Hero of the Soviet Union (1916-1985), RU (b. 1916) |
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Ян, Егор, Ефим, Саня, Саша, Стас, Рома, Уриы, Януш, Яков, Эрик, Ігор, Юрий, Юрій, Фёдор, Костя, Макар, Марат, Мирон, Михан, Иван, Илья, Олег, Женя, Лев, Юри, Юра, Коля, Макс, Марк, Миша, Ален, Глеб, Митяй, Паша, Петя, Пётр, Даня, Дима, Ваня, Витя, Вова, Влад, Влас, Петр, and Алекс