Turkish honorary title formerly given to officers of high rank, 1640s, from Turkish pasha, earlier basha, from bash "head, chief" (no clear distinction between -b- and -p- in Turkish), from Old Persian pati- "master," from PIE *poti- (see potent) + root of shah. Earlier in English as bashaw (1530s).[pasha etymology, pasha origin, 英语词源]