Surname Costanzi (Costanzi 
) , in the entire world, is quite a rare cognomen. The last name Costanzi is characteristic of Malta, where it is quite a common surname, Italy, where it is quite a rare surname, and Argentina, where it is a rare surname. In absolute terms, it is commonest in Italy, Argentina, and Brazil. Much less frequently, Costanzi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Costanzi | Brazil, Italy, Malta, United States, Argentina |
| giacomo costanzi (b. 1473) |
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| giovanni costanzi Italian gem-engraver (b. 1674) |
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| tommaso costanzi Italian gem-engraver (b. 1700) |
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| placido costanzi Italian painter (1702-1759), IT (b. 1702) |
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| giovanni battista costanzi Italian composer, IT (b. 1704) |
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| carlo costanzi Italian gem-engraver (b. 1705) |
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| carlo costanzi (b. 1703) |
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| domenico costanzi Italian entrepreneur (1819-1898), IT (b. 1819) |
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giulio costanzi Italian engineer, IT (b. 1875) |
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| vincenzo costanzi Italian classical philologist (1863-1929), IT (b. 1863) |
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| edoardo costanzi IT (b. 1864) |
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| giuseppe costanzi Righteous Among the Nations, IT (b. 1907) |
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| elena costanzi Righteous Among the Nations, IT (b. 1908) |
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| teodorico moretti costanzi Italian philosopher, IT (b. 1912) |
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| angelo costanzi AT (b. 1908) |
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