Cognomen Fiallos (Fiallos 
) , globally, is quite a common family name. The family name Fiallos is habitual in Latin America and the Caribbean, particularly Honduras, where it is quite a common surname, El Salvador, where it is quite a rare surname, and Nicaragua. Measured by absolute frequency, this name is the most popular in Honduras, the United States, and El Salvador.
| VARIANT | COUNTRY |
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| Fiallos | Nicaragua, Honduras, Ecuador, United States, El Salvador |
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josé jerónimo zelaya fiallos Honduran head of state (1780-1869), HN (b. 1780) |
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aníbal delgado fiallos Honduran politician, HN (b. 1936) |
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| andrea fiallos Biography of Guayaquileña Activist Founder of Fundación la Iguana, EC (b. 1901) |
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| carmen fiallos (b. 1925) |
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enrique constantino fiallos HN |
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jose fiallos association football player, HN (b. 1996) |
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| nicolas fiallos Ecuadorian musician, EC |
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| diana carolina coello fiallos researcher |
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