Last name Sio (Sio 
, シオ 
, سيو 
, among others...) , in the world, is a common family name. The cognomen Sio is habitual in Macao, where it is a common surname, Mozambique, where it is quite a rare surname, and Hong Kong. In absolute terms, it most frequently occurs in Japan, Macao, and Mozambique. Likewise, Sio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sio | Philippines, Macao, Taiwan, Mozambique, Indonesia |
| シオ | Japan |
| سيو | Saudi Arabia, Iraq, Sudan, Syria, Morocco |
| Сио | Kazakhstan, Kyrgyzstan |
| Сіо | Ukraine |
| filippo benedetto de sio ES (b. 1585) |
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| al de sio performer (20th century) (b. 1901) |
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teresa de sio Italian singer, IT (b. 1955) |
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su'a william sio New Zealand politician, NZ (b. 1960) |
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keneti sio Samoan politician and former rugby union player, WS (b. 1964) |
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alessio de sio Italian journalist, IT (b. 1968) |
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victoria sio French singer, FR (b. 1985) |
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giovanni sio Ivorian association football player, FR (b. 1989) |
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ken sio Australian rugby league footballer, AU (b. 1990) |
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scott sio Australian rugby union player, AU (b. 1991) |
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michael sio New Zealand rugby league footballer, NZ (b. 1993) |
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| david sio rugby union player (1962-), WS (b. 1962) |
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| nina sio rugby player (b. 1963) |
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| vincenzo de sio Italian footballer, IT (b. 1972) |
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| francesca romana santoni de sio researcher ORCID ID = 0000-0002-6522-0499 |
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