សមត្ថ (Khmer) comes from Pali samattha, from Sanskrit समर्थ, from Sanskrit अर्थ, from Proto-Indo-Iranian Hártʰam, from Proto-Indo-European h₁ert-, from Proto-Indo-European h₁er- — earth.
សមត្ថ (Khmer): to be capable, able, qualified, fit, competent