O'Halloran

== English == === Etymology === Variant of Halloran. === Proper noun === O'Halloran (plural O'Hallorans) A surname from Irish. ==== Statistics ==== According to the 2010 United States Census, O'Halloran is the 9839th most common surname in the United States, belonging to 3289 individuals. O'Halloran is most common among White (93.28%) individuals. === Further reading === Hanks, Patrick, editor (2003), “O'Halloran”, in Dictionary of American Family Names, volume 3, New York: Oxford University Press, →ISBN.