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Cognomen Portus (Part
, Port
, Portus
) , all over the world, is a common last name. The last name Portus is habitual in Estonia, where it is quite a common surname, Kuwait, where it is quite a rare surname, and Lesotho. Not in comparison with a country's population, it is the most numerous in Indonesia, the United States, and Germany. Much less frequently, Portus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Part, Port | Brazil, France, United States, Indonesia, Germany |
| Portus | Spain, Brazil, United States, United Kingdom, Germany |
| Porz | Spain, Brazil, France, United States, Germany |