No, because it would then be Italian. But Sicilian is considered a distinct language close to standard Italian. Neapolitan is intermediate between them.
No, although they both have Latin origins.
No, they are completely different concepts.
Brendan is the same in English and Italian, because of the tendency to respect the original language's spelling.
Brandon is the same in English and Italian, because of the tendency to respect the original language's spelling.
Names are the same in every language.
Italian and Latin are not the same. Italian is a modern Romance language descended from Latin, while Latin is an ancient language that was spoken in the Roman Empire. Italian has taken influence from Latin but has evolved over time into a distinct language with its own grammar, vocabulary, and pronunciation.
Sicilian Language is different from Italian. Just like the other romance languages (French, Spanish, or Portuguese) are different from Italian. The Sicilian grammar shares the same fundamentals as the other Latin language and, in my opinion, has a closer relation to Spanish grammar.
Mark Loundy is the same in English and Italian, because the original language's spelling tends to be respected.
Since "Hershey" is a name, it will probably remain the same when pronoucned in Italian, but maybe with a slightly different sound as letters and sounds can differ slightly from language to language.
Italian and Welsh are not directly related as they come from different language families. Italian is a Romance language, originating from Latin, while Welsh is a Celtic language, part of the Brythonic branch. They evolved separately from different ancestral languages.
Today, yes. All Romans speak Italian today, its their national language. In ancient times the Romans spoke Latin, and modern Italian is, like all the other Romance languages, an offshoot of Latin.
All the same.