Family name ธัญเจริญ (ธัญเจริญ 
, Thanyajoen, Thunyacharean) , in the entire world, is a very rare cognomen. The cognomen ธัญเจริญ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ธัญเจริญ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธัญเจริญ | Thailand |
Thancharoer, Thangjaroen, Thangyajaroen, Thanjaleanr, Thanyachaeoen, Thanyachareint, Thanyachareon, Thanyacharern, Thanyacharoen, Thanyacharuen, Thanyajarern, Thanyajarone, Thanyaroen, Thuncharoen, Thunyacharern, and Thunyachroen