Cognomen Callao (Callao 
) , all over the world, is quite a common family name. The last name Callao is characteristic of Philippines, where it is quite a rare surname, Bolivia, and Peru. Much less frequently, Callao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Callao | Bolivia, Spain, Philippines, Argentina, Peru |
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concepció callao Spanish opera singer (1895-1959), ES (b. 1895) |
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| josefa callao librarian and archivist from Madrid, ES (b. 1907) |
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| francesca callao i oliva Spanish opera singer (1934-1981), ES (b. 1934) |
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| m a pilar callao researcher |
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