If they weren't from Northern Italy I wouldn't be surprised , I have friends with the last name DeRosa and in my family there are Defillippo's those could be the original names or like I said they could be from Northern Italy originally . Now to be clear when I am saying the people with no vowels at the end are all from Northern Italy I mean the family's origin . I haven't been to Ellis Island in a long time but I believe you can look up ancestors last names and it if it was changed you should be able to see what it started out as .