O'Halleran

== English == === Etymology === Variant of Halloran. === Proper noun === O'Halleran (plural O'Hallerans) A surname from Irish. ==== Statistics ==== According to data collected by Forebears in 2014, O'Halleran is the 413125th most common surname in the United States, belonging to 36 individuals. === Further reading === Hanks, Patrick, editor (2003), “O'Halleran”, in Dictionary of American Family Names, volume 3, New York: Oxford University Press, →ISBN.