Names starts with o Northern Ireland Genealogy
- O…..
- OAK
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- OBOYLE
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- OBRIENS
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- OBRYAN
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- OCAIN
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- ODONNEL
- ODONNELL
- ODONOHOE
- ODORNAN
- ODOUGHERTY
- ODRAIN
- ODREAN
- ODRISCOLL
- OFARRELL
- OFEE
- OFFICER
- OFLAHERTY
- OFLINN
- OFLYNN
- OGELBIE
- OGELVIE
- OGILBEY
- OGILBY
- OGLE
- OGLEBY
- OGLEVEY
- OGRADY
- OHAGAN
- OHAGEN
- OHAGGAN
- OHALE
- OHALY
- OHAMILL
- OHANLIN
- OHANLON
- OHARA
- OHARE
- OHARRA
- OHARRAH
- OHARROH
- OHAYER
- OHEA
- OHEAFY
- OHEAR
- OHEARE
- OHEARN
- OHEGAN
- OHERE
- OKANE
- OKEARE
- OKEIFF
- OKELLY
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- OLEARY
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- OLIPHER
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- OLIVE
- OLIVER
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- OLLIVER
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- OLPHERTS
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- OMALLY
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- OMIT
- OMULLAN
- OMULLEN
- OMULLIN
- OMULVENA
- OMULVENNA
- ONAIL
- ONAILL
- ONEAL
- ONEALE
- ONEALL
- ONEIL
- ONEILE
- ONEILL
- ONIEL
- ONIELE
- ONIELL
- ONIUL
- ONLEY
- OPEFIELD
- OPRAY
- OPREAY
- OPREY
- ORAIGAN
- ORAW
- ORAWE
- ORBISON
- ORD
- ORDERLY
- ORE
- OREGAN
- OREILLEY
- OREILLY
- ORENS
- ORFORD
- ORLAND
- ORME
- ORMESBY
- ORMSBEY
- ORMSBY
- ORNEAL
- ORNEILL
- ORO
- OROARKE
- ORORK
- ORORKE
- OROURK
- OROURKE
- ORR
- ORRAM
- ORRELL
- ORRET
- ORRIL
- ORRUM
- ORSON
- OSBACK
- OSBEEK
- OSBORN
- OSBORNE
- OSBOROUGH
- OSBOURN
- OSBOURNE
- OSBROUGH
- OSBURGH
- OSBURN
- OSBURNE
- OSEBURN
- OSHAUGHNESSY
- OSHAUGHNESY
- OSHEA
- OSTEN
- OSULLIVAN
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