Family name Seco (Seco 
, Seku 
, سيكو 
) , across the world, is a common cognomen. The last name Seco is habitual in Portugal, where it is quite a common surname, Argentina, where it is quite a rare surname, and Venezuela. Measured by absolute frequency, it most frequently occurs in Argentina, Egypt, and Philippines. Also, Seco is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seco | Spain, Philippines, India, Argentina, Venezuela |
| Seku | Indonesia, South Africa, Spain, Ghana, India |
| سيكو | Saudi Arabia, Sudan, Algeria, Egypt, Iraq |
| Siccus | Spain, Peru |
| fernando alvares seco Portuguese cartographer, PT (b. 1550) |
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francisco seco de lucena Spanish writer (1867-1904), ES (b. 1867) |
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carmen seco ES (b. 1888) |
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rafael seco humbrías Spanish painter and sculptor (1925-2010), ES (b. 1925) |
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| rafael seco y sánchez Spanish university teacher, ES (b. 1895) |
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aurora seco torrecillas Spanish chemist, ES (b. 1954) |
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| vasco alves seco BR (b. 1898) |
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manuel seco de arpe Spanish composer, ES (b. 1958) |
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| manuel seco gutiérrez ES (b. 1912) |
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| carlos seco serrano Spanish historian, ES (b. 1923) |
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| miguel seco seco Spanish politician (1925-2009), ES (b. 1925) |
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| agustín sixto seco Spanish physician (1926-2004), ES (b. 1926) |
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| manuel seco reymundo Spanish linguist, ES (b. 1928) |
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luis a. seco Director of RiskLab |
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| manuel francisco mesa seco CL (b. 1925) |
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