Family name Ago (Ago 
, آغا 
, Аго 
) , all over the world, is a common surname. The cognomen Ago is habitual in Albania, where it is quite a common surname, Greece, where it is quite a rare surname, and Togo. Measured by absolute frequency, it is commonest in Nigeria, Philippines, and Albania. Also, Ago is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ago | Nigeria, Ethiopia, Philippines, Indonesia, Albania |
| آغا | Turkey, Afghanistan, Iran |
| Аго | Armenia, Russia, Ukraine |
| ago of friuli Duke of Friuli (b. 650) |
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pietro ago Italian politician (1872-1966), IT (b. 1872) |
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roberto ago Italian jurist and judge of the International Court of Justice, IT (b. 1907) |
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ago künnap Estonian linguist, EE (b. 1941) |
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| ago agaj politician, AL (b. 1897) |
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| ago reio (b. 1895) |
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| ago rooseste (b. 1900) |
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| ago viljari Estonian clergyman, EE (b. 1910) |
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ago rinken Estonian chemist, EE (b. 1960) |
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ago pajur Estonian historian, EE (b. 1962) |
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| ago pärtel (b. 1905) |
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ago panini Italian musician, IT (b. 1967) |
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| ago aava (b. 1908) |
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ago lilleorg Estonian clergyman, EE (b. 1969) |
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| ago vallas Estonian historian and statistician, SE (b. 1924) |
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