True, Michael probably chose the name Anthony in honor of HIS grandfather (i.e. Antonio Andolini), and of course the middle name was in honor of his father Vito.

However, could it be considered disrespectful to use the Americanized "Anthony" instead of Antonio? Clearly that point was to drill home the fact Michael was trying to distance himself from his roots.

I believe I heard in the commentaries of the trilogy for Part I if I am not mistaken that they couldn't really get the young boy's attention so it was decided that he would be called "Anthony" to make him respond which was the boy's actual name.

I didn't know that either, interesting. I don't know about Sicilians but for my own Italian American family, it is customary to name your son after his grandfather and daughter after her grandmother (even after uncles and aunts too). I have a few cousins with the same name because of this. And one entire family has so many Joe's and Jo's for Josephine, you call out Joe/Jo and everybody responds lol. Godfather fans can correct me if I'm wrong but he named him Antonio to follow tradition. Back when Antonio (Anthony) was growing up, it was very customary to take the Americanized version of your name to fit in. You also have a confirmation name in addition to your first and middle name. You take the name of a saint.

Anthony is not an uncommon name in America. But, until fairly recently, most Anthonys were Italian-Americans.

Are you Italian-American?