Cognomen Σίμος (Simu 
, Simos 
, Σίμος ) , in all the world, is a common family name. The cognomen Σίμος is characteristic of Greece, where it is quite a common surname, Romania, where it is quite a rare surname, and Cyprus. Measured by absolute frequency, it is commonest in Greece, Bangladesh, and Romania. Also, Σίμος is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Simu | Greece, Bangladesh, Romania, India, Ethiopia |
| Simos | Greece, Romania, United States, India, Cyprus |
| Σίμος | Greece |
| ευστάθιος σίμος Greek politician, GR (b. 1804) |
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| σπύρος σίμος Greek politician and journalist (1868-1935), GR (b. 1868) |
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| νίκος σίμος (1922-2000), GR (b. 1922) |
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| βασίλης σίμος Greek painter, GR (b. 1933) |
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| γιώργος σίμος Greek footballer, GR (b. 1978) |
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