Cognomen 杜炎 (杜炎 
) , around the globe, is a very rare surname. The family name 杜炎 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 杜炎 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 杜炎 | China |