Family name Rataj (Rataj 
, Ратай 
, راتاج) , all around the world, is quite a common last name. The family name Rataj is habitual in Czechia, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Poland. Measured by absolute frequency, this name is the most popular in Poland, Czechia, and Germany. Likewise, Rataj is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rataj | Germany, Poland, Czechia, United States, Slovakia |
| Ратай | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
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jan rataj Czech member of Czech council, regional politician and mayor, CZ (b. 1855) |
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maciej rataj President of Poland (1884-1940), UA (b. 1884) |
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jan rataj PL (b. 1889) |
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| františek sal. rataj CZ (b. 1841) |
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| václav rataj CZ (b. 1848) |
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| emanuel rataj CZ (b. 1872) |
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| franciszek rataj Polish officer, PL (b. 1894) |
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| bohumír rataj (b. 1885) |
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| jan rataj Czechoslovak archaeologist (1913-2002), CZ (b. 1913) |
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| maria rataj Polish writer, PL (b. 1918) |
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| julian rataj PL (b. 1911) |
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igor rataj Slovak ice hockey player, SK (b. 1973) |
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michal rataj Czech composer, CZ (b. 1975) |
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| karel rataj botanist (1925-2014), CZ (b. 1925) |
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| stanislav rataj (b. 1928) |
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