View the most religious surnames in Ireland

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

O'Callagan is borne by more people in Australia than any other country or territory. It can be rendered as:. For other potential spellings of O'Callagan click here.

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

The last name O'Callagan is the 6,063,924^th most frequently used surname world-wide, held by approximately 1 in 728,754,592 people. This last name is primarily found in Oceania, where 60 percent of O'Callagan live; 60 percent live in Australasia and 60 percent live in Australia and New Zealand.

The surname O'Callagan is most frequently occurring in Australia, where it is held by 6 people, or 1 in 4,499,284. In Australia it is primarily found in: Victoria, where 50 percent are found, New South Wales, where 17 percent are found and Queensland, where 17 percent are found. Besides Australia this last name exists in 3 countries. It also occurs in England, where 20 percent are found and The United States, where 20 percent are found.

O'Callagan Family Population Trend ^{historical fluctuation}

The incidence of O'Callagan has changed through the years. In England the share of the population with the last name contracted 71 percent between 1881 and 2014.

O'Callagan Last Name Statistics ^demography

The religious devotion of those holding the O'Callagan last name is chiefly Catholic (100%) in Ireland.