Cognomen Otto (Otto 
, Отто 
, אוטו 
) , across the world, is a widespread family name. The surname Otto is habitual in Antigua and Barbuda, where it is a common surname, Liechtenstein, where it is quite a common surname, and Germany (explore the name in all countries). In absolute terms, this name is the most popular in Germany, the United States, and South Africa. More prevalently, Otto is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Otto | Japan, Brazil, United States, Germany, Guatemala |
| Отто | Kazakhstan, Estonia, Belarus, Ukraine, Russia |
| אוטו | Israel |
Calciotto, Edgar, Edmund, Edward, Oddo, Odo, Omer, Ortu, Othon, Otis, Otmar, Oto, Oton, Ott, Ottangolo, Otte, Ottens, Ottmar, Ottokar, Ottone, Ottò, Ottó, Otó, Otón, Udo, Ótto, Óttó, Ōt, Όθων, Одо, Ота, Отмар, Ото, Отон, Отт, Оттон, Удо, أتو, أوت, أودو, অটো, ออตโต, ออตโต้, อุตป้อ, อ็อตโต้, อ็อทโท่, โอตโต, ウド, オット, オト, オード, 奥多, 奥特, 奧圖, and 小渡
| otto, prince of hungary first-born son of (Saint) Stephen I, king of Hungary (b. 1005) |
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| otto, margrave of the nordmark German noble, DE (b. 1040) |
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| von reval otto (b. 1280) |
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| von bruchsal und bolanden otto German aristocrat, DE (b. 1304) |
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franz otto zu braunschweig-lüneburg Prince of Luneberg 1555-1559, DE (b. 1530) |
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| anton otto German theologian, DE (b. 1505) |
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| johannes otto PL (b. 1500) |
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| siegmund otto DE (b. 1505) |
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| valentin otto Thomaskantor, DE (b. 1529) |
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markus otto diplomat of the Free Imperial City of Strasbourg, DE (b. 1600) |
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| georg otto German composer (ca. 1550-1618), DE (b. 1550) |
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| thomas otto DE (b. 1545) |
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| julius konrad otto (b. 1562) |
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| noah otto DE (b. 1568) |
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| johann otto, freiherr von oppersdorf aich friedstein 1584 Častolovice - 6 Jan 1647 Hradec Králové Nad (b. 1585) |
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