Cognomen Simionescu (Simionescu 
) , worldwide, is quite a common surname. The cognomen Simionescu is habitual in Romania, where it is quite a common surname, Belgium, where it is a rare surname, and Ireland. Measured by absolute frequency, the name is most common in Romania, Italy, and the United States. Much less frequently, Simionescu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Simionescu | Belgium, Italy, Romania, United States, Spain |
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grigore simionescu Romanian general, RO (b. 1857) |
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ion th. simionescu Romanian geologist (1873-1944), RO (b. 1873) |
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gheorghe gh. simionescu Romanian Orthodox priest, RO (b. 1895) |
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| staur simionescu (b. 1859) |
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| ioan th. simionescu botanist (b. 1873) |
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nicolae simionescu Romanian physician, RO (b. 1926) |
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| constantin simionescu Romanian lawyer, Righteous Among the Nations, RO (b. 1889) |
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| virgil simionescu (b. 1881) |
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elena simionescu RO (b. 1937) |
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mariana simionescu Romanian tennis player, RO (b. 1956) |
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| mircea horia simionescu Romanian writer, RO (b. 1928) |
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| teodora simionescu Romanian basketball player, RO (b. 1935) |
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| constantin simionescu RO (b. 1926) |
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| constantin simionescu Romanian politician, RO (b. 1937) |
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| maya simionescu Romanian biologist, RO (b. 1937) |
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