Paris - Île-de-France
- O'donoghue
- O'loughlin
- O'malley
- O'rorke
- O'shea
- O'toole
- Oakley
- Oates
- Obach
- Obada
- Obam
- Oberlaender
- Oberli
- Oberlé
- Obermajster
- Oberman
- Obi
- Obiang
- Obigand
- Obispo
- Obled
- Obouckang
- Obouroundouo
- Oboussier
- Obraztsova
- Obrenovitch
- Obrien
- Obrist
- Obrou
- Obukhova
- Oby
- Ocana
- Ocariz
- Occhionorelli
- Ocio
- Oconnor
- Oculy
- Odabas
- Odasso
- Oddos
- Odeimi
- Odekerken
- Odelia
- Odelot
- Odend'hal
- Odendahl
- Odeon
- Odette
- Odeye
- Odie
- Odievre
- Odin-steiner
- Odion
- Odlum
- Odolant
- Odonnell
- Odorico
- Odoux
- Oducayen
- Oehl
- Oeschger
- Oesterreicher
- Oet
- Oeur
- Oeuvre Du Saint Sépulcre
- Ofamin
- Offenstein
- Office Parisien
- Ogarte
- Ogata
- Ogbi
- Oget
- Oggioni
- Ogino
- Ognjanovic
- Ognov
- Ogonowski
- Ogoudjobi
- Ogoundele
- Ogoyard
- Oguic
- Ogulluk
- Oh My Cream
- Ohannessian
- Ohara
- Ohia
- Ohlmann
- Ohnheiser
- Ohnouna
- Ohrel
- Oinino
- Oiry
- Oishi
- Ojeda
- Ok
- Okagbue
- Okajima
- Okawa
- Oke
- Okenge
