Last name Tranquillo (Tranquillo 
) , all around the world, is quite a rare family name. The last name Tranquillo is habitual in Italy, where it is quite a rare surname, Argentina, where it is a very rare surname, and the United States. Not in comparison with a country's population, the name is most common in Italy, the United States, and Brazil. Likewise, Tranquillo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tranquillo | Philippines, Brazil, Italy, Argentina, United States |
| giovanni francesco tranquillo Italian presbyter and poet, IT (b. 1501) |
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| ilario tranquillo Italian theologian and writer, IT (b. 1668) |
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flavio tranquillo Italian journalist and writer, IT (b. 1962) |
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| elisabetta tranquillo researcher |
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| robert t tranquillo researcher |
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| vito tranquillo researcher (ORCID 0000-0002-8121-5956) |
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| domingo tranquillo IT |
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| robert tranquillo |
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