Family name Simplex (Simpel 
, Simplex 
, Syml 
) , in all the world, is a rare surname. The surname Simplex is habitual in Trinidad and Tobago, where it is quite a rare surname, Netherlands, where it is a rare surname, and Greece. Measured by absolute frequency, it is the most numerous in Indonesia, Netherlands, and France. Very seldom, Simplex is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Simpel | Indonesia, United States, India, Greece, Netherlands |
| Simplex | Indonesia, Spain, United States, India, France |
| Syml | Myanmar |
| Sempel | Indonesia, Netherlands, Australia, United States, Trinidad and Tobago |
| gnaeus caecilius simplex 1st century AD Roman senator (b. 50) |
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| lucius julius marinus caecilius simplex Late 1st/early 2nd century Roman senator and consul (b. 50) |
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| marcus simplicius simplex (b. 200) |
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| bernard simplex French politician, FR (b. 1953) |
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| simplex nthala Malawian footballer, MW (b. 1988) |
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