Where does “vistolo” come from?

vistolo (Italian) comes from Italian visto, from Vulgar Latin visitus, from Latin vīsus, from Proto-Celtic wissos, from Proto-Indo-European widtós, from Proto-Indo-European weyd- — to see.

Ancestry of “vistolo”, step by step

Step	Language	Word	Meaning
1	Italian	visto	masculine singular past participle of vedere;...
2	Vulgar Latin	visitus	—
3	Latin	vīsus	having been seen
4	Proto-Celtic	wissos	known
5	Proto-Indo-European	widtós	seen; known
6	Proto-Indo-European	weyd-	to see

Every word from Proto-Indo-European weyd- →Every word from Proto-Indo-European widtós →Every word from Proto-Celtic wissos →