View the most religious surnames in Ireland

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

O'Callahan is held by more people in The United States than any other country or territory. It may occur in the variant forms:. For other potential spellings of this name click here.

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

The last name is the 816,514^th most widespread last name globally. It is borne by around 1 in 21,371,102 people. The last name occurs mostly in The Americas, where 57 percent of O'Callahan reside; 57 percent reside in North America and 56 percent reside in Anglo-North America.

The surname is most widely held in The United States, where it is borne by 174 people, or 1 in 2,083,097. In The United States O'Callahan is most numerous in: California, where 14 percent live, Massachusetts, where 14 percent live and New York, where 11 percent live. Without taking into account The United States this surname is found in 9 countries. It is also common in New Zealand, where 25 percent live and Australia, where 10 percent live.

O'Callahan Family Population Trend ^{historical fluctuation}

The prevalency of O'Callahan has changed over time. In The United States the share of the population with the last name contracted 34 percent between 1880 and 2014; in Ireland it contracted 32 percent between 1901 and 2014 and in England it contracted 27 percent between 1881 and 2014.

O'Callahan Last Name Statistics ^demography

The religious adherence of those carrying the surname is principally Catholic (100%) in Ireland.

The amount O'Callahan earn in different countries varies greatly. In United States they earn 38.55% more than the national average, earning $59,783 USD per year and in Canada they earn 14.95% less than the national average, earning $42,255 CAD per year.