View the most religious surnames in Ireland

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

The last name O'Calaghan is more frequently found in Ireland than any other country or territory. It can be rendered as:. Click here for further possible spellings of O'Calaghan.

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

O'Calaghan is the 8,193,072^nd most common surname internationally, held by approximately 1 in 1,457,509,183 people. This last name occurs predominantly in Europe, where 80 percent of O'Calaghan live; 60 percent live in Northern Europe and 60 percent live in British Isles.

This surname is most commonly used in Ireland, where it is borne by 2 people, or 1 in 2,354,470. In Ireland it is most prevalent in: Munster, where 50 percent reside. Without taking into account Ireland this last name exists in 4 countries. It is also found in Australia, where 20 percent reside and England, where 20 percent reside.

O'Calaghan Family Population Trend ^{historical fluctuation}

The frequency of O'Calaghan has changed through the years. In Ireland the number of people carrying the O'Calaghan last name contracted 33 percent between 1901 and 2014 and in The United States it contracted 89 percent between 1880 and 2014.

O'Calaghan Last Name Statistics ^demography

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