French word mariage comes from French -age, French marier

Detailed word origin of mariage

Dictionary entry	Language	Definition
-age	French (fra)	(rare) Forming collective nouns.. Forming nouns with the sense of "action or result of Xing" or, more rarely, "action related to X".. Forming nouns with the sense of "state of being (a) X".
marier	French (fra)	(reflexive, se marier) to get married, to wed. (transitive) to wed, to marry.
mariage	French (fra)	Marriage. Union. Wedding.

Words with the same origin as mariage