View the most religious surnames in Ireland

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

The surname O'Brennan occurs in Canada more than any other country/territory. It can occur in the variant forms:. Click here for further potential spellings of this surname.

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

The last name O'Brennan is the 1,385,851^st most frequently held family name throughout the world, borne by around 1 in 46,123,708 people. The last name occurs mostly in The Americas, where 57 percent of O'Brennan live; 57 percent live in North America and 57 percent live in Anglo-North America.

The surname O'Brennan is most widely held in Canada, where it is carried by 51 people, or 1 in 722,463. In Canada it is primarily concentrated in: British Columbia, where 88 percent reside and Manitoba, where 12 percent reside. Aside from Canada this surname occurs in 4 countries. It also occurs in Ireland, where 25 percent reside and The United States, where 25 percent reside.

O'Brennan Family Population Trend ^{historical fluctuation}

The occurrence of O'Brennan has changed over time. In Ireland the share of the population with the surname rose 390 percent between 1901 and 2014; in The United States it rose 1,950 percent between 1880 and 2014 and in England it rose 1,400 percent between 1881 and 2014.

O'Brennan Last Name Statistics ^demography

The religious adherence of those carrying the O'Brennan last name is chiefly Catholic (80%) in Ireland.

The amount O'Brennan earn in different countries varies greatly. In United States they earn 75.26% more than the national average, earning $75,625 USD per year and in Canada they earn 15.16% less than the national average, earning $42,152 CAD per year.