Last name Mainiero (Mainiero 
) , all over the world, is a rare cognomen. The last name Mainiero is habitual in Italy, where it is a rare surname, the United States, where it is a very rare surname, and Argentina. Not in comparison with a country's population, this name is the most popular in Italy, the United States, and the United Kingdom. Very seldom, Mainiero is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mainiero | Canada, Argentina, Italy, United Kingdom, United States |
| mattias mainiero Italian journalist, IT (b. 1955) |
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| lisa mainiero American management academic, US (b. 1957) |
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| samantha mainiero researcher (ORCID 0000-0002-2310-5994) |
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| markus mainiero researcher |
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| martha b mainiero researcher |
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| fabrizio mainiero researcher |
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