Where does “sbirro” come from?

sbirro (Italian) comes from Italian birro, from Latin birrus, from Gaulish birros, from Proto-Celtic birros — short.

sbirro (Italian): cop

Definitions

Step	Language	Word	Meaning
1	Italian	birro	—
2	Latin	birrus	hooded coat; hooded cape
3	Gaulish	birros	—
4	Proto-Celtic	birros	short

sbirro — Etymology, Origin & Word History | Etymology Explorer