ស្មើ (Khmer) comes from Old Khmer ស្មេ, from Proto-Mon-Khmer sməʔ, from Pali samā, from Sanskrit सम, from Proto-Indo-Iranian samHás, from Proto-Indo-European somHós, from Proto-Indo-European sem- — together, one.
ស្មើ (Khmer): same, alike; equal; impartial