French word passager comes from Old French -age, Old French passer (To pass; to pass by.), Middle French passage

Detailed word origin of passager

Dictionary entry	Language	Definition
-age	Old French (fro)	Forms nouns with the sense of 'action or result of'. Forms nouns with the sense of 'state of being'.
passer	Old French (fro)	To pass; to pass by.
passage	Middle French (frm)
passage	Old French (fro)	Passage (part of a route or journey).
passagier	Old French (fro)
passagier	Middle French (frm)
passager	French (fra)	(informal, of a street or place) Busy.. Of a short duration; temporary; transitory, fleeting, flighty.. Whose presence in a location is only temporary; passing. (archaic) Traveller.. Passenger.

Words with the same origin as passager