Save Gender Masculine Usage Thai Scripts ประจักษ์ชัย(Thai) Pronounced Pron. /pra˨˩.t͡ɕak̚˨˩.ˈt͡ɕʰaj˧/ [key·simplify] Other Forms FormsPrajakchai, Prachakjai, Prajakjai Meaning & History From Thai ประจักษ์ (prachak) meaning "clear, manifest, evident" and ชัย (chai) meaning "victory".