Surname Clementius (Clementius 
) , all around the world, is a rare family name. The last name Clementius is characteristic of Indonesia, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Very seldom, Clementius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Clementius | United Kingdom, Indonesia, South Africa, Cyprus |
| clementius jacobus gillebert 24 May 1770 Voormezele - 7 Jan 1833 St.Jan (b. 1770) |
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| clementius valerius marcellinus Prefect of the II Legion of Auxiliary in 268 AD |
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