Cognomen Obrien (Obrien 
, Обриен 
) , globally, is a widespread last name. The surname Obrien is habitual in Northern Europe, particularly Ireland, where it is quite a common surname, Aland Islands, and Jersey (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Obrien is the forename as well as the last name.
| christopher obrien (1861–1935) Irish physician and skin specialist (b. 1861) |
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| warren obrien American politician, US (b. 1922) |
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kady obrien American pop singer |
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| patrick s. obrien (b. 1963) |
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| jim obrien college basketball player (1967–1967) Fordham |
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| obrien sitepu Indonesian political candidate, ID |
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| eugene obrien researcher, ORCID id # 0000-0002-6867-1009 |
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| donal obrien researcher (ORCID 0000-0002-2729-872X) |
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| thomas obrien researcher |
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| jim obrien college basketball player (1969–1970) Northern Illinois |
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| stephen p obrien researcher |
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| lean obrien researcher, ORCID id # 0000-0002-8032-5379 |
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