Surname Arnoldo (Arnoldo 
, Арнольдо 
, Арнальдо 
) , in the world, is a common last name. The family name Arnoldo is habitual in Latin America and the Caribbean, particularly Nicaragua, where it is quite a common surname, Mexico, and Venezuela, where it is quite a rare surname. More frequently, Arnoldo is the forename as well as the last name.
| nicolò de arnoldo bishop of the Roman Catholic Church |
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| adriano arnoldo Italian tug of war competitor, IT |
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| luca arnoldo researcher (ORCID 0000-0002-8068-5219) |
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| anthony arnoldo researcher (ORCID 0000-0003-0687-3040) |
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| erick arnoldo association football player from Argentina, AR (b. 1995) |
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