| Surname | Individuals |
|---|---|
|
O'Brien
|
1 |
|
O'Connell
|
3 |
|
O'Connor
|
1 |
|
O'Dell
|
1 |
|
O'Hare
|
1 |
|
O'Harna
|
1 |
|
O'Neil
|
2 |
|
O'Toole
|
2 |
|
Oalchlaen
|
1 |
|
Obed
|
1 |
|
Octavius
|
1 |
|
Oda
|
2 |
|
Odilo
|
1 |
|
Odulgarde
|
1 |
|
Oengus
|
1 |
|
Oeren
|
1 |
|
of Denmark and Norway
|
2 |
|
Offenburger
|
4 |
|
ofGreece
|
1 |
|
ofHess-Cassel
|
2 |
|
ofPalatinate
|
1 |
|
ofParis
|
1 |
|
Ogasawara
|
4 |
|
Ogden
|
3 |
|
Oge
|
1 |
|
Ogilvy
|
1 |
|
Ogstoun
|
2 |
|
Ohio
|
2 |
|
Ohlfest
|
1 |
|
Ohlinger
|
5 |
|
Olaf
|
1 |
|
Olafsdottir
|
1 |
|
Old
|
1 |
|
Oldenburg
|
7 |
|
Olfert
|
1 |
|
Olfertsen
|
1 |
|
Olga
|
1 |
|
Olioll
|
2 |
|
Ollfinsnechta
|
1 |
|
Olp
|
1 |
|
Olson
|
1 |
|
Oman
|
4 |
|
On
|
1 |
|
Onias
|
1 |
|
Onslow
|
2 |
|
Oosterhout
|
1 |
|
Orabella
|
1 |
|
Orange
|
5 |
|
Ordan
|
1 |
|
Ordgar
|
1 |
|
Ordrad
|
1 |
|
Ordway
|
1 |
|
Oreguen
|
1 |
|
Orkney
|
3 |
|
Orlamuende
|
1 |
|
Orleans
|
3 |
|
Orm
|
1 |
|
Ormsby
|
2 |
|
Orr
|
3 |
|
Orreby
|
1 |
|
Orrell
|
2 |
|
Ortenau
|
1 |
|
Ortiz
|
5 |
|
Orun
|
1 |
|
Orwiler
|
1 |
|
Osbaldeston
|
1 |
|
Osbaldston
|
1 |
|
Osborn
|
7 |
|
Osborne
|
2 |
|
Osceria
|
1 |
|
Oslac
|
1 |
|
Osnler
|
1 |
|
Ostrander
|
54 |
|
Ostrevant
|
1 |
|
Ostrogoths
|
4 |
|
Othinn
|
1 |
|
Otsen
|
2 |
|
Ottarson
|
1 |
|
Ovei
|
1 |
|
Overbey
|
2 |
|
Overholt
|
1 |
|
Overton
|
1 |
|
Owain
|
6 |
|
Owald
|
1 |
|
Owen
|
5 |
|