French word rigolo comes from French -o, French rigoler

Detailed word origin of rigolo

Dictionary entry	Language	Definition
-o	French (fra)	Added to a noun or an adjective after apocope, to create a familiar synonym.
rigoler	French (fra)	(intransitive, informal) To joke, to kid.. (intransitive, informal) To laugh, especially laugh out loud.
rigolo	French (fra)	(colloquial) funny (amusing; comical).

Words with the same origin as rigolo