I spotted that too. Some of the other surnames are Spanish (Aquino, Santos, Rom?n, Dur?n), or Middle Eastern (Al?, Salad?n), Deetjen looks Dutch or Flemish and Pujol is Catalan.
You spoiled my fun Chiri, Duran is one of Mr. AE's Cibao surnames, I wish I had a camera to capture the look on his face when I told him he might be part Haitian. One of his best friends from SD is a Roman, and he's as white as I am.
I think there are definitely some inaccuracies in that 'study'.