Cognomen Allegretto (Allegretto 
) , throughout the world, is a rare family name. The last name Allegretto is characteristic of Italy, where it is a rare surname, Argentina, and Canada. Not in comparison with a country's population, this name is the most popular in the United States, Italy, and Argentina. Very seldom, Allegretto is the forename as well as the last name.
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| Allegretto | Brazil, Italy, Argentina, United States, Canada |
| allegretto nuzi Italian painter (1315-1373), IT (b. 1315) |
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| manuela allegretto author (20th century) (b. 1901) |
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| michael allegretto US (b. 1944) |
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| gregorio di allegretto Italian artist |
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| walter allegretto Ph.D. University of British Columbia 1969 |
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| juan a allegretto researcher (ORCID 0000-0002-7371-2610) |
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