FromAnglo-Norman-cie, ultimately fromLatin-cia,-tia,Ancient Greek-κια(-kia),-τια(-tia), originally variants ofLatin-ia andAncient Greek-ια(-ia),-ία(-ía) or-εια(-eia). Original loan words likepharmacy andpapacy could have formed the model.
-cy
In sense of a state, a condition, often replaces a terminal-t, as inpregnancy (frompregnant). Exceptions includenormalcy (no terminal-t innormal) andbankruptcy (terminal-t inbankrupt retained).