Jouer etymology in French

French word jouer comes from Latin iocus (A form of amusement. A joke, jest.)

Dictionary entry	Language	Definition
iocus	Latin (lat)	A form of amusement. A joke, jest.
ioculus	Latin (lat)
ioculor	Latin (lat)
*ioco	Latin (lat)	(Vulgar Latin) I play.
*iocāre	Vulgar Latin (la-vul)
joer	Old French (fro)	To play.
jouer	French (fr)	To play (a role). To play (engage in games or play). To play (produce music from a musical instrument).

Jouer etymology