Families & clans — O

38 clans and families beginning with O. Back to the A–Z.

• O'Boyle
• O'Brien
• O'Connell, William
• O'Connor
• O'Connor / Ochiltree
• O'Farrell
• O'Neill, Martin
• 
  Oakhall
• Oakley
• 
  Oakwood
• 
  Oban
• 
  Ochiltree
• 
  Ogg
  clan
• 
  Ogg of Tarragann
• 
  Ogilvie
• 
  Ogilvie of Inverarity
• 
  Ogilvie of Inverarity / Ochterlonie
• 
  Ogilvie of Strathallan
• 
  Ogilvy
• 
  Ogilvy of Airlie
• 
  Ogilvy of Inverquharity
• 
  Ohio
• 
  Oilmens
• 
  Oliphant
• 
  Oliver
• 
  Oneness
• 
  Ontario
• Oren Peterson
• 
  Oriflame
• 
  Orkney
• 
  Orman
• Orr Senior, Gerald William
• Ostermeier
• 
  Otago
• 
  Ottawa
• 
  Outlander
• 
  Owen
• 
  Owen of Wales