Family name Mihaiu (Mihaiu 
) , all around the world, is quite a rare cognomen. The cognomen Mihaiu is habitual in Romania, where it is quite a common surname, Portugal, where it is a rare surname, and Czechia. Measured by absolute frequency, it is the most numerous in Romania, Italy, and the United States. Very seldom, Mihaiu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mihaiu | Romania, Italy, United States, Germany, Portugal |
| constantin mihaiu priest, RO (b. 1891) |
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| valeriu mihaiu Romanian lawyer, RO (b. 1897) |
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virgil mihaiu writer, jazz critic, diplomat, jazz aesthetics professor, polyglot, cultural promoter, and performer, RO (b. 1951) |
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liviu mihaiu RO (b. 1963) |
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| mihaiu liviu gorcea Romanian politician from Baia de Criș, Hunedoara County, RO |
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| cosmin mihaiu physical therapy entrepreneur; CEO and co-founder of MIRA Rehab |
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| andreas mihaiu footballer, RO (b. 1998) |
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Mr, Mihai, Sorin, Sofia, Alina, Andra, Calin, Crina, Betty, Paula, Romeo, Denis, David, Diana, Doina, Laura, Liana, Liviu, Tammy, Ninel, Elena, Flori, Maria, Oana, Ioan, Vlad, Ms, Ana, Ann, Adi, Dan, Ion, Mari, Mary, Mara, Alex, Irina, Alin, Cami, Radu, Ryan, John, Joan, Nick, Nicu, Nell, Neli, Nela, Anca, and Ionel