Barry, "abou" is followed by a first name, not a last name. It means "father of". When I lived in Palestine I was called "abou Steve" in my office as my son's name is Steve. I hope this helps. So, as you can see, calling Mr. George Mitchell "abou Mitchell" was incorrect.
Declassified docs reveal Pinochet ordered 1976 assassination of diplomat in U.S. (AP)
from the article: Report: Mitchell to arrive in Mideast this week with no plan, no agenda