Cognomen Alt (Alto 
, Alt , Altus 
, among others...) , in all the world, is a common last name. The cognomen Alt 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. Much less frequently, Alt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alt, Alto | Germany, Philippines, Brazil, United States, Mexico |
| Altus | Germany, Brazil, United States, Mexico, Turkey |
| アルト | Japan |
| Альт | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| אלט | Israel |
Ailt, Al, Allr, Alte, Altece, Alter, Altermann, Altman, Altmann, Altmannová, Altová, Altso, Altu, Altul, Altviool, Altán, Canto, Halt, Oalt, Oalts, Olt, Oot, Oud, Àlt, Ált, Ãĺť, Ālｔ, Алт, Альтер, Альтман, Олтман, אלטמן, אלת, אלתר, آلت, الت, التمان, الط, ةلت, ىلت, 奥特, 奧特曼, ﺍﻟﻂ, Ａlt, and Ａｌｔ
| georg alt German historian and translator, DE (b. 1450) |
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salome alt Mistress to German Prince bishop, AT (b. 1568) |
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| hans ulrich alt German painter, DE (b. 1557) |
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gallus alt Abbot of St. Gall, CH (b. 1610) |
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| claudius alt 1590-1633; Jesuit, Philosoph, Rektor; geb. in Fribourg/Suisse, gest. in München; Jesuit; Philosoph; Rektor (b. 1590) |
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| tobie-protais alt CH (b. 1618) |
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| heinrich alt PL (b. 1631) |
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| anna alt DE (b. 1650) |
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| antoine d' alt (1662-1736), CH (b. 1662) |
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| gerhard alt DE (b. 1674) |
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| philipp samuel alt (b. 1689) |
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| henry alt (1730-1768) (b. 1730) |
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| augustus alt British soldier and engineer, AU (b. 1731) |
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| just alt (1732-1801) (b. 1732) |
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| herman theodore augustus alt (1734-1815) (b. 1734) |
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