Cognomen Ottoni (Ottoni 
) , all around the world, is quite a rare family name. The last name Ottoni is characteristic of Brazil, where it is quite a rare surname, Italy, where it is a rare surname, and Portugal. Measured by absolute frequency, it most frequently occurs in Brazil, Italy, and Argentina. Much less frequently, Ottoni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ottoni | Brazil, Argentina, Canada, Japan, Italy |
| lorenzo ottoni Italian (Roman) artist, sculptor and portraitist (1648-1736), IT (b. 1648) |
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| aurelio guarnieri ottoni Italian historian (1737-1788), IT (b. 1737) |
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teófilo ottoni Brazilian politician, BR (b. 1807) |
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cristiano benedito ottoni Brazilian engineer and politician (1811-1896), BR (b. 1811) |
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| josé elói ottoni Brazilian poet (1764-1851), BR (b. 1764) |
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raimundo ottoni de castro maia Brazilian businessman, BR (b. 1894) |
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| carlos honório benedito ottoni Brazilian politician (1846-1919), BR (b. 1846) |
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| ottoni ferreira maciel Brazilian journalist, BR (b. 1870) |
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| ottoni minghelli Brazilian politician (1907-1997), BR (b. 1907) |
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| filippo ottoni Italian director, dubbing director, screenwriter (born 1938), IT (b. 1938) |
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alexandre ottoni BR (b. 1979) |
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| luiz marcio ottoni person identified in the Museu da Pessoa collection, BR (b. 1943) |
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| gustavo ottoni Brazilian actor, BR (b. 1958) |
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| claudio ottoni Italian association football manager and association football player, IT (b. 1960) |
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| marcelo henrique fernandes ottoni researcher |
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