There are 70 unique female surnames beginning with O:

O'Brian	O'Briant	O'Brien	O'Bryan	O'Dell	O'Donal	O'Donnell
O'Hara	O'Harra	O'Malley	O'Neal	O'Neil	Oatley	Oberdier
Oberlander	Oby	Odell	Oder	Odey	Odle	Odor
Ogan	Ogden	Ogle	Oglesby	Ohaver	Ohnsman	Oldaker
Oldham	Oldoerp	Olds	Oliphant	Olive	Oliver	Oller
Ollin	Oman	Onofryton	Onsler	Opphile	Oppihle	Orahood
Orcena	Orders	Organ	Ormeroid	Orr	Orsbern	Orshern
Orstern	Ortman	Osborn	Osborne	Osbourn	Osburn	Osmond
Ostenhouse	Oswald	Otis	Ott	Otte	Ours	Ousler
Outcatt	Overacker	Overfield	Overholser	Overly	Owen	Owens

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