Family name Сидорович (Sidorovich 
, Сидорович 
, Sydorovych 
) , all around the world, is quite a common cognomen. The family name Сидорович is habitual in Belarus, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Ukraine. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Belarus, Russia, and Ukraine.
| VARIANT | COUNTRY |
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| Sidorovich | Belarus, Brazil, Russia, United States, Slovenia |
| Сидорович | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Sydorovych | United States, Ukraine, Spain, Turkey |
Sidorovitch, and Sidorowich
| сидорович савина осипівна Ukrainian art historian and teacher (1895-1972), UA (b. 1895) |
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сидорович, александр владимирович BY (b. 1942) |
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| сидорович, георгий степанович Russian economist (1903-1985), BY (b. 1903) |
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дмитрий сидорович Belarusian musician (1965-2014), BY (b. 1965) |
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| сидорович, яков николаевич RU (b. 1913) |
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| сидорович, александр николаевич RU (b. 1924) |
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| сидорович, иван романович BY (b. 1927) |
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| сидорович, евгений антонович BY (b. 1928) |
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| сидорович, вадим евгеньевич BY (b. 1962) |
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| сидорович, руслан михайлович Ukrainian politician and lawyer, UA (b. 1974) |
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| иоанн сидорович RU |
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Ян, Саша, Сидр, Янош, Янна, Ілля, Іван, Інна, Ігор, Юлия, Юлія, Юрий, Юрій, Єгор, Костя, Мария, Марія, Мирон, Мілан, Алиса, Алена, Алесь, Егор, Аліна, Емма, Инна, Зоя, Лев, Яна, Єва, Клим, Майя, Алла, Анна, Адам, Петр, Дар'Я, Неля, Нина, Ніна, Вера, Віра, Леся, Ліна, Женя, Олег, Илья, Иван, and Анеля