What are the most common O', D', St. & de surnames?
Anyone have any ideas?

The ones I seem to hear most often are O'Brien, D'Alessio, St. Claire and deBecker... anyone have any other ideas? Anyone know?
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Looking at the list of the 100 most common Irish names and using a completely unscientific estimation of which tend to drop or keep the O':
O'Brien
O'Connor
O'Neill
O'Reilly
O'Connell
O'Donnell
O'Shea
O'Leary
O'Keeffe
O'Rourke
O'DwyerFor Mc/Mac:
McCarthy
McLoughlin
Maguire
McGrath
McDonnell
MacMahon
MacKenna
Magee
MacNamara
MacDonald
MacDermott
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I think you're right about O'Brien. O'Neill probably comes next.
In the Netherlands De Vries ("the Frisian") and De Jong (the young") are very common.
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O'Connor is another common O' name.
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As to the D':

D'Angelo
D'Agostino
D'Alessandro
D'Ambrosio

are quite common around Italy.
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I know quite a few people with the surnames of de Luca/deLuca..
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