Surname Radzio (Radzio 
) , worldwide, is a rare cognomen. The cognomen Radzio is habitual in Poland, where it is quite a rare surname, Germany, where it is a rare surname, and Belgium. Measured by absolute frequency, this name is the most popular in Poland, Germany, and the United States. Likewise, Radzio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Radzio | Germany, Belgium, United States, Poland, Canada |
| helena radzio Polish Righteous Among the Nations, PL (b. 1902) |
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| sławomir radzio Polish Righteous Among the Nations, PL (b. 1922) |
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| jerzy radzio Polish Righteous Among the Nations, PL (b. 1925) |
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| maria radzio Polish Righteous Among the Nations, PL (b. 1928) |
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| sebastian radzio Polish footballer, PL (b. 1991) |
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