Last name Dio (Dio 
, Dì 
, ديو 
) , in the entire world, is a common surname. The family name Dio is characteristic of Philippines, where it is quite a rare surname, Senegal, and Indonesia. Measured by absolute frequency, it is the most numerous in Indonesia, Philippines, and Nigeria. Likewise, Dio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dio | Taiwan, Philippines, Italy, Indonesia, Nigeria |
| Dì | Myanmar, Vietnam, Italy, China, Algeria |
| ديو | Iraq, Sudan, Palestinian Territory, Syria, Saudi Arabia |
| Дио | Kazakhstan, Kyrgyzstan |
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dio chrysostom ancient Greek philosopher, TR (b. 40) |
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| cassius dio Roman senator and consul in 291 (b. 250) |
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dio viruly (b. 1882) |
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louis dio French military personnel (1908-1994), FR (b. 1908) |
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alfredo di dio Italian Army officer (1920–1944), IT (b. 1920) |
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antonio di dio IT (b. 1922) |
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| johnny dio American mobster (1914–1979), US (b. 1914) |
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dio kobayashi Japanese circus performer, JP (b. 1972) |
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maty dio SK (b. 1973) |
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| fabiano di dio Italian jazz piano player. (b. 1950) |
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| dio lequaglie Italian beach volleyball player, IT (b. 1963) |
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| dio syuhada ID (b. 1956) |
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| salvatore di dio German athletics competitor, DE (b. 1972) |
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| conny dio Indonesian singer, ID (b. 1975) |
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| sabine dio DE (b. 1967) |
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