Cognomen Casullo (Casullo 
) , in all the world, is a rare surname. The surname Casullo is characteristic of Uruguay, where it is quite a rare surname, Argentina, where it is a rare surname, and Italy. Measured by absolute frequency, this name is the most popular in Argentina, Italy, and the United States. Much less frequently, Casullo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casullo | Italy, Canada, Argentina, United States, Uruguay |
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guido maria casullo Catholic bishop in Italy and Brazil, IT (b. 1909) |
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alicia beatriz casullo psychoanalyst from Argentina, AR (b. 1940) |
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nicolás casullo Argentinian writer, AR (b. 1944) |
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| bob casullo American football coach, US (b. 1951) |
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| anthony casullo photographer from the USA, US |
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| joseph casullo researcher |
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| josé maría casullo Argentinian association football player, AR |
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