View the most religious surnames in Ireland

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

O'Brain is held by more people in The United States than any other country or territory. It can occur as:. Click here to see other possible spellings of this surname.

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

The last name O'Brain is the 6,360,413^th most common last name at a global level, borne by approximately 1 in 809,727,324 people. The last name O'Brain occurs predominantly in The Americas, where 67 percent of O'Brain are found; 56 percent are found in North America and 56 percent are found in Anglo-North America. It is also the 3,941,740^th most frequent given name throughout the world, borne by 9 people.

This surname is most common in The United States, where it is carried by 5 people, or 1 in 72,491,787. In The United States it is most numerous 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 it exists in 6 countries. It is also found 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 over time. In The United States the number of people bearing the O'Brain last name fell 75 percent between 1880 and 2014.

O'Brain Last Name Statistics ^demography

The religious adherence of those bearing the last name is chiefly Catholic (100%) in Ireland.