View the most religious surnames in Ireland

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

O'Brain is carried by more people in The United States than any other country or territory. It may occur as a variant:. For other possible spellings of this surname click here.

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

This last name is the 6,360,413^th most widespread family name on a worldwide basis, held by approximately 1 in 809,727,324 people. The last name O'Brain occurs mostly in The Americas, where 67 percent of O'Brain reside; 56 percent reside in North America and 56 percent reside in Anglo-North America. O'Brain is also the 3,941,740^th most frequently used given name throughout the world. It is borne by 9 people.

The surname O'Brain is most widespread in The United States, where it is borne by 5 people, or 1 in 72,491,787. In The United States O'Brain is mostly found in: Alabama, where 20 percent are found, Arkansas, where 20 percent are found and Colorado, where 20 percent are found. Other than The United States this last name occurs in 6 countries. It also occurs in Australia, where 22 percent are found and England, where 22 percent are found.

O'Brain Family Population Trend ^{historical fluctuation}

The prevalency of O'Brain has changed through the years. In The United States the number of people who held the O'Brain last name decreased 75 percent between 1880 and 2014.

O'Brain Last Name Statistics ^demography

The religious adherence of those carrying the O'Brain last name is chiefly Catholic (100%) in Ireland.