Cognomen รุจน์ธนาพจน์ (รุจน์ธนาพจน์ 
) , across the world, is an extremely rare surname. The surname รุจน์ธนาพจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| รุจน์ธนาพจน์ | Thailand |