View the most religious surnames in Ireland

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

The last name O'Callaghan is most common in Ireland. It can also be rendered as a variant: Ò'callaghan. For other possible spellings of this surname click here.

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

O'Callaghan is the 23,050^th most commonly occurring family name internationally, borne by around 1 in 309,726 people. This surname is mostly found 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 surname O'Callaghan is most numerous in Ireland, where it is borne by 9,845 people, or 1 in 478. In Ireland it is most common in: Munster, where 57 percent live, Leinster, where 29 percent live and Ulster, where 8 percent live. Beside Ireland this surname exists in 69 countries. It is also common in England, where 22 percent live and Australia, where 20 percent live.

O'Callaghan Family Population Trend ^{historical fluctuation}

The frequency of O'Callaghan has changed over time. In Ireland the share of the population with the surname increased 286 percent between 1901 and 2014; in England it increased 2,484 percent between 1881 and 2014; in The United States it increased 671 percent between 1880 and 2014; in Wales it increased 3,591 percent between 1881 and 2014 and in Scotland it increased 965 percent between 1881 and 2014.

O'Callaghan Last Name Statistics ^demography

The religious devotion of those holding the O'Callaghan surname is chiefly 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.