All over the world, กลสมรรถ (กลสมรรถ 
) is a very rare boy's given name. The forename กลสมรรถ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare male name.
| VARIANT | COUNTRY |
|---|---|
| กลสมรรถ | Thailand |
พจนาวาณิชย์, and สิมะพิเชฐ