Surname Allegro (Allegro 
, Allègre 
, Alacer 
) , worldwide, is quite a rare family name. The cognomen Allegro is characteristic of Italy, where it is quite a rare surname, Portugal, and Belgium, where it is a rare surname. Measured by absolute frequency, it is commonest in Italy, the United States, and France. Very seldom, Allegro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Allegro | Brazil, Italy, Argentina, United States, France |
| Allègre | United States, Democratic Republic of the Congo, France, Belgium |
| Alacer | Philippines, Spain, Brazil, India |
Allegra, Allegretto, Allegrissimo, and Allégro
| filippo allegro Roman Catholic bishop, IT (b. 1829) |
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| agostino allegro IT (b. 1846) |
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allegro grandi Italian cyclist, IT (b. 1907) |
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john marco allegro English archaeologist and Dead Sea Scrolls scholar, GB (b. 1923) |
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| allegro celso fabro (1902-1962) restaurateur (b. 1902) |
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| allegro facchini Italian association football player, IT (b. 1905) |
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massimiliano allegro Italian association football player and manager, IT (b. 1967) |
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martin allegro |
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| nunzio allegro Italian archaeologist (1946-), IT (b. 1946) |
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| calogero allegro (b. 1940) |
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| anna maria allegro (b. 1952) |
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| valery allegro chess player (b. 1965) |
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| alban allegro CH (b. 1957) |
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| giuseppe allegro (b. 1961) |
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| yves allegro Swiss tennis player, CH (b. 1978) |
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