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

The last name O'Callaghan is carried by more people in Ireland than any other country/territory. It may be rendered in the variant forms: Ò'callaghan. For other possible spellings of O'Callaghan click here.

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

It is the 23,050^th most commonly occurring last name on a worldwide basis, held by approximately 1 in 309,726 people. O'Callaghan occurs predominantly in Europe, where 69 percent of O'Callaghan are found; 68 percent are found in Northern Europe and 68 percent are found in British Isles.

The last name is most numerous in Ireland, where it is carried by 9,845 people, or 1 in 478. In Ireland it is most numerous in: Munster, where 57 percent reside, Leinster, where 29 percent reside and Ulster, where 8 percent reside. Besides Ireland it is found in 69 countries. It is also found in England, where 22 percent reside and Australia, where 20 percent reside.

O'Callaghan Family Population Trend ^{historical fluctuation}

The occurrence of O'Callaghan has changed over time. In Ireland the number of people who held the O'Callaghan surname expanded 286 percent between 1901 and 2014; in England it expanded 2,484 percent between 1881 and 2014; in The United States it expanded 671 percent between 1880 and 2014; in Wales it expanded 3,591 percent between 1881 and 2014 and in Scotland it expanded 965 percent between 1881 and 2014.

O'Callaghan Last Name Statistics ^demography

The religious devotion of those carrying the O'Callaghan surname is predominantly Catholic (99%) in Ireland.

The amount O'Callaghan earn in different countries varies markedly. In United States they earn 59.89% more than the national average, earning $68,993 USD per year and in Canada they earn 18.55% more than the national average, earning $58,900 CAD per year.