Family name Trean (Trean 
) , around the globe, is a very rare surname. The cognomen Trean is habitual in Bulgaria, where it is a rare surname, Vietnam, where it is a very rare surname, and Spain. Measured by absolute frequency, it is the most numerous in Bulgaria, Vietnam, and the United States. Much less frequently, Trean is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Trean | Vietnam, Spain, United States, Bulgaria, India |