Cognomen Siau (Siau 
, شياو 
, Sitella 
) , in the world, is quite a rare family name. The surname Siau is characteristic of Singapore, where it is quite a rare surname, Malaysia, and Belgium. In absolute terms, this name is the most popular in Malaysia, Indonesia, and Belgium. Also, Siau is the forename as well as the last name.
| françois antoine léonard siau French politician, FR (b. 1744) |
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| emmanuel bonafos i siau Spanish physician and botanist (1774-1854), FR (b. 1774) |
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| isabelle siau French politician, FR (b. 1964) |
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| keng siau (b. 1964) |
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| siau pheng lee researcher |
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| siau hui mah researcher |
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| richard siau researcher |
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| keith siau researcher |
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| evan siau researcher |
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| jean siau FR |
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| siau chian ching Malaysian figure skater, MY (b. 1993) |
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| terry siau (b. 1986) |
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