View the most partisan surnames in The United States

Where Does The Last Name O'Leary Come From? ^{nationality or country of origin}

O'Leary occurs in Ireland more than any other country or territory. It may also appear in the variant forms:. Click here to see other possible spellings of O'Leary.

How Common Is The Last Name O'Leary? ^{popularity and diffusion}

The surname is the 13,816^th most frequently used surname on a worldwide basis It is held by around 1 in 180,559 people. This last name is predominantly found in Europe, where 55 percent of O'Leary reside; 55 percent reside in Northern Europe and 55 percent reside in British Isles. O'Leary is also the 1,308,380^th most widely held forename in the world, borne by 57 people.

This last name is most frequently occurring in Ireland, where it is borne by 13,589 people, or 1 in 347. In Ireland O'Leary is most prevalent in: Munster, where 54 percent are found, Leinster, where 32 percent are found and Connaught, where 3 percent are found. Outside of Ireland this last name exists in 81 countries. It also occurs in The United States, where 21 percent are found and England, where 18 percent are found.

O'Leary Family Population Trend ^{historical fluctuation}

The incidence of O'Leary has changed over time. In Ireland the number of people bearing the O'Leary surname rose 304 percent between 1901 and 2014; in The United States it rose 148 percent between 1880 and 2014; in England it rose 750 percent between 1881 and 2014; in Wales it rose 481 percent between 1881 and 2014 and in Scotland it rose 781 percent between 1881 and 2014.

O'Leary Last Name Statistics ^demography

The religious devotion of those carrying the last name is primarily Catholic (99%) in Ireland.

In The United States O'Leary are 53.23% more likely to be registered Republicans than the national average, with 100% being registered with the party.

The amount O'Leary earn in different countries varies greatly. In United States they earn 72.17% more than the national average, earning $74,290 USD per year and in Canada they earn 2.66% more than the national average, earning $51,006 CAD per year.