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 occurs more in Ireland more than any other country or territory. It may appear as:. For other possible spellings of O'Calaghan click here.

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

This surname is the 8,193,072^nd most frequent family name on earth It is held by around 1 in 1,457,509,183 people. The surname O'Calaghan occurs mostly in Europe, where 80 percent of O'Calaghan are found; 60 percent are found in Northern Europe and 60 percent are found in British Isles.

It is most prevalent in Ireland, where it is borne by 2 people, or 1 in 2,354,470. In Ireland it is mostly found in: Munster, where 50 percent are found. Without taking into account Ireland this last name occurs in 4 countries. It is also common in Australia, where 20 percent are found and England, where 20 percent are found.

O'Calaghan Family Population Trend ^{historical fluctuation}

The prevalency of O'Calaghan has changed through the years. In Ireland the number of people bearing 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 carrying the O'Calaghan last name is predominantly Catholic (100%) in Ireland.