View the most religious surnames in Ireland

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

O'Brain occurs most in The United States. It may occur as a variant:. For other possible spellings of this name click here.

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

O'Brain is the 6,360,413^th most frequently occurring surname at a global level, borne by around 1 in 809,727,324 people. The surname is mostly found in The Americas, where 67 percent of O'Brain live; 56 percent live in North America and 56 percent live in Anglo-North America. O'Brain is also the 3,941,740^th most commonly used forename in the world. It is borne by 9 people.

This surname is most commonly used in The United States, where it is held by 5 people, or 1 in 72,491,787. In The United States it is primarily concentrated in: Alabama, where 20 percent are found, Arkansas, where 20 percent are found and Colorado, where 20 percent are found. Besides The United States O'Brain is found 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 over time. In The United States the number of people bearing the O'Brain surname declined 75 percent between 1880 and 2014.

O'Brain Last Name Statistics ^demography

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