Italian word stronzo comes from Langobardic *strunz

Detailed word origin of stronzo

Dictionary entry	Language	Definition
*strunz	Langobardic (lng)
stronzo	Italian (ita)	(vulgar, slang, figurative) A generally despicable person.. (vulgar, slang, figurative) bastard, shit, son of a bitch. (vulgar, slang, literal) turd.