Last name Caeiro (Caeiro 
) , throughout the world, is quite a common family name. The last name Caeiro is habitual in Portugal, where it is quite a common surname, Malta, where it is quite a rare surname, and Luxembourg. Measured by absolute frequency, it is the most numerous in Portugal, Argentina, and India. Very seldom, Caeiro is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Caeiro | Brazil, Argentina, India, Angola, Portugal |
| josé caeiro (b. 1712) |
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celeste caeiro Portuguese pacifist worker, PT (b. 1933) |
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| francisco josé caeiro Portuguese politician (1890-1956), PT (b. 1890) |
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| igrejas caeiro Portuguese actor and politician, PT (b. 1917) |
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| josé caeiro Spanish association football player (1925-1981), ES (b. 1925) |
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| francisco josé da gama caeiro (1928-1994) (b. 1928) |
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| manuel luís caeiro Portuguese poet, PT (b. 1931) |
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| oscar caeiro (b. 1937) |
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| rui caeiro PT (b. 1943) |
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| antónio caeiro (b. 1949) |
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| lois caeiro ES (b. 1951) |
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| teresa caeiro Portuguese politician, PT (b. 1969) |
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| antónio caeiro PT (b. 1966) |
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| juan p caeiro researcher |
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| joaquim caeiro researcher |
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