Last name Casassa (Casassa 
) , in all the world, is quite a rare cognomen. The last name Casassa is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Bolivia. In absolute terms, the name is most common in Italy, the United States, and Argentina. Very seldom, Casassa is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casassa | Brazil, Italy, Argentina, United States, France |
| nicolò casassa IT (b. 1839) |
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| ethel casassa American chemist, US (b. 1924) |
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| guido casassa Peruvian politician (1925-2002), PE (b. 1925) |
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andrew a. casassa politician in Massachusetts, US, US |
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narcís casassa i font Catalan politician, ES |
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| gino casassa Chilean glaciologist |
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| silvia casassa researcher, ORCID id # 0000-0003-0217-4920 |
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| e casassa researcher |
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| mirco casassa IT (b. 1992) |
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