In my readings on Giuliano, I also find Salvatore called Turiddu. (For more info on this visit http://www.sicilian.net and click on Salvatore Giuliano) I'm hazarding a guess here, but I've often found that the difference between the Italian I learned in college and the Sicilian dialect is that the o's are replaced by u's. I'd love to go to Sicily and learn firsthand if i'm right or wrong.
By the way...for the Turi Giuliano that posts on this message board...thanks for that beautiful picture of Sicily's coastline.
Where is that exactly?