"What is a Guido?"
"What do you mean, what is a Guido?"
"What does the word Guido mean?"
"It's a name. Like Michael."
This is the conversation I had with an Italian while traveling to Italy. Based on multiple interviews while in Italy myself and multiple sources to back it up, the word 'Guido' is an actual proper name. It now makes sense why I always see restaurants named "Guidos Pizza/Meatballs/Restaurant/etc.". Imagine if your name was actually "Guido".
(Notice the Guido in the black shirt below. Guido fashion - ista)