French word surpoids comes from French poids (Weight.), French surmonter

Detailed word origin of surpoids

Dictionary entry	Language	Definition
poids	French (fra)	Weight.
surmonter	French (fra)	(transitive) to overcome, to surmount, to get over. (transitive) to top, to crown (a building, etc.).
surpoids	French (fra)	Excess weight; excess fat, fatty tissue.