Online Etymology Dictionary

pasha: 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).
bashaw (n.): 1530s, earlier Englishing of pasha.
paschal (adj.): early 15c., "of or pertaining to Easter," from Old French paschal (12c.) and directly from Late Latin paschalis, from pascha "Passover, Easter," from Greek pascha "Passover," from Aramaic pasha "pass over," corresponding to Hebrew pesah, from pasah "he passed over." (cf. Passover). Pasche was an early Middle English term for "Easter" (see Easter).