Surname Leonardis (Leonardis 
) , all over the world, is quite a rare family name. The last name Leonardis is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Switzerland. In absolute terms, this name is the most popular in Italy, the United States, and Argentina. Very seldom, Leonardis is the forename as well as the last name.
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| Leonardis | Italy, Brazil, United States, Argentina, France |
| francesco antonio leonardis Roman Catholic bishop (b. 1684) |
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anton leonardis Bishop of Trieste and Capo d'Istria, IT (b. 1756) |
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| jacopo leonardis Italian painter (1723-1794), IT (b. 1723) |
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| roberto de leonardis Italian dialogue writer and screenwriter (1913-1984), IT (b. 1913) |
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| giovanni leonardis IT (b. 1928) |
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| ales leonardis Slovenian professor of computer and information science (b. 1950) |
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| jean-marie leonardis French politician, FR (b. 1956) |
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tyrone leonardis (b. 1997) |
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| massimo de leonardis IT (b. 1949) |
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| ales leonardis Ph.D. University of Ljubljana 1993 |
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| antonino leonardis Ph.D. Scuola Normale Superiore di Pisa 2014 |
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| eustachio de leonardis Roman Catholic archbishop |
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| joshua leonardis researcher ORCID ID = 0000-0002-4885-9186 |
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| francesco de leonardis researcher (ORCID 0000-0001-5801-7225) |
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| francesco de leonardis researcher (ORCID 0000-0002-6278-1565) |
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