Cognomen Русак (Rusak 
, Русак 
) , worldwide, is a common surname. The last name Русак is characteristic of Belarus, where it is quite a common surname, Croatia, where it is quite a rare surname, and Poland. In absolute terms, it most frequently occurs in Eastern Europe, particularly Belarus, Russia, and Poland. Very seldom, Русак is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rusak | Belarus, Poland, United States, Indonesia, Croatia |
| Русак | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
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васіль русак BY (b. 1896) |
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| русак, адам герасимович Belarusian poet, writer and children's writer (1904-1987), BY (b. 1904) |
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| русак, иван тимофеевич RU (b. 1906) |
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русак петро степанович UA (b. 1963) |
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| галина русак BY (b. 1930) |
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| валентин николаевич русак BY (b. 1936) |
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| русак, нина александровна BY (b. 1937) |
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| русак, владимир степанович BY (b. 1949) |
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| леанід вячаслававіч русак BY (b. 1952) |
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| віктар рамуальдавіч русак Belarusian politician, BY (b. 1963) |
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| русак, виктор владимирович BY (b. 1955) |
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| пётр романович русак Ukrainian association football player, UA (b. 1970) |
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| русак александр олегович Ukrainian military personnel, UA (b. 1990) |
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| русак, сергей григорьевич Belarusian association football player, BY (b. 1993) |
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Зоя, Ілля, Іван, Інна, Ігор, Юлия, Юлія, Юрий, Юрій, Мария, Элла, Марія, Мирон, Алина, Алена, Аліна, Антон, Адель, Агния, Артем, Артур, Марфа, Соня, Егор, Ихар, Жан, Оля, Яна, Макс, Марк, Алла, Анна, Адам, Петр, Дар'Я, Неля, Нина, Ніна, Вера, Віра, Леся, Ліна, Олег, Илья, Инна, Иван, Борис, and Ганна