French word ponton comes from French pont ((dentistry, Canada) bridge. Bridge. Deck.), French -on

Detailed word origin of ponton

Dictionary entry	Language	Definition
pont	French (fra)	(dentistry, Canada) bridge. Bridge. Deck.
-on	French (fra)	Forming diminutives of things, including some animals.. Indicating origin or occupation. (physics, and, biology) -on.
ponton	French (fra)	(military) pontoon. (nautical) pontoon (floating structure supporting a bridge or dock). (nautical) pontoon (the boat).

Words with the same origin as ponton