Paris - Île-de-France
- Nuyaouet
- Nuytens
- Nyame
- Nyemeck
- Nyssen
- Nébot
- Négrier
- O Connor
- O Mahony
- O Sullivan
- O'connell
- O'donnell
- O'hana
- Obame
- Obe
- Obedia
- Obegi
- Obel
- Obeng
- Obeniche
- Oberdoerffer
- Oberlé
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- Obertelli
- Obis
- Obled
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- Occuly
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- Ocloo
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- Octave
- Oculi
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- Oddoux
- Ode
- Odie
- Odoux
- Oe
- Oet
- Offenstein
- Offner
- Offredo
- Oftadeh
- Ogab
- Ogbazghi
- Oget
- Ogez
- Ogien
- Ogilvie
- Ogino
- Ognibene
- Ogrizek
- Oguz
- Ogée
- Ohanna
- Ohara
- Oheix
- Ohlmann
- Ohlson
- Ohno
- Ohrel
- Oiseau
- Ok
- Oka
- Okabe
- Okala
- Oko
- Oksenberg
- Okutucu
- Okuyama
- Olagnon
- Olariu
- Olchanski
- Oleron
- Olivar
- Olivari
- Olivarius
- Oliveira Dias
- Oliveira Silva
- Olivero de Rubiana
- Ollerdissen
- Olmer
- Olmez
- Olszer
- Olszewski
- Oltean
- Oltramare
- Omezzine
- Omori
- Omoruyi
- Oms
- On
- Onana
- One
- Oneill
- Oneto