French word coursier comes from French -ier, French course (Errand. Race. Run, running.)

Detailed word origin of coursier

Dictionary entry	Language	Definition
-ier	French (fra)	Used to form the names of jobs. Used to form the names of ships. Used to form the names of trees bearing a particular type of fruit.
course	French (fra)	Errand. Race. Run, running.
coursier	French (fra)	Courier, messenger Steed.

Words with the same origin as coursier