Cognomen Januszko (Januszko 
) , in the entire world, is a rare surname. The cognomen Januszko is characteristic of Poland, where it is quite a rare surname, Slovakia, where it is a rare surname, and Germany, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Poland, the United States, and Slovakia. More frequently, Januszko is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Januszko | Germany, Slovakia, United States, United Kingdom, Poland |
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maciej andrzej januszko (b. 1953) |
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| zbigniew januszko PL (b. 1916) |
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| tadeusz januszko Polish pathologist, PL (b. 1929) |
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natalia januszko PL (b. 1987) |
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| leonard januszko (b. 1938) |
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| andrzej januszko PL (b. 1938) |
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| bolesław januszko Polish Righteous Among the Nations, PL |
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| piotr januszko researcher, PL |
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