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Re: What are the most common O', D', St. & de surnames?
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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