Surname ประจญ (Combat 
, Prachon 
, ประจญ ) , in the entire world, is quite a rare cognomen. The cognomen ประจญ is habitual in Romania, where it is a rare surname, Ghana, and France. Not in comparison with a country's population, it is commonest in Indonesia, Brazil, and France. Likewise, ประจญ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Combat | Brazil, France, Indonesia, Ghana, Democratic Republic of the Congo |
| Prachon | United States, Thailand |
| ประจญ | Thailand |