Cognomen Alto (Alto 
, Alt , Altus 
) , across the world, is a common family name. The family name Alto is habitual in Estonia, where it is quite a common surname, Germany, and Switzerland, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Germany, the United States, and Philippines. Very seldom, Alto is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alt, Alto | United States, Mexico, Philippines, Germany, Brazil |
| Altus | United States, Mexico, Germany, Turkey, Brazil |
| アルト | Japan |
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alto of altomünster Irish monk, IE (b. 701) |
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eustace de monte alto Norman noble, GB (b. 1040) |
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| hugh de monte alto GB (b. 1050) |
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| bernardus de monte alto (b. 1150) |
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| alto arche AT (b. 1854) |
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bobby alto American actor (1938-2012), US (b. 1938) |
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attilio alto IT (b. 1937) |
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| alto pritzl (b. 1915) |
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| jesse alto American poker player, US (b. 1927) |
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| massimiliano alto Italian actor, dub actor and dubbing director, IT (b. 1973) |
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| neal m alto researcher (ORCID 0000-0002-7602-3853) |
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| michelle e alto researcher |
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| alto balo politician |
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| alto von tannstein Abbot of the Benedictine Abbey St. Emmeram, Regensburg |
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| barry alto researcher (ORCID 0000-0001-7054-2081) |
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