View the most religious surnames in Ireland

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

The surname O'Rilley is found most in The United States. It can be found as a variant:. For other potential spellings of this last name click here.

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

This last name is the 4,908,606^th most widespread family name on a worldwide basis, held by approximately 1 in 455,471,620 people. The last name O'Rilley occurs predominantly in The Americas, where 75 percent of O'Rilley live; 69 percent live in North America and 69 percent live in Anglo-North America.

This surname is most common in The United States, where it is held by 11 people, or 1 in 32,950,812. In The United States O'Rilley is most prevalent in: Arizona, where 36 percent reside, Illinois, where 18 percent reside and Michigan, where 18 percent reside. Not including The United States this surname exists in 4 countries. It is also common in Australia, where 13 percent reside and England, where 6 percent reside.

O'Rilley Family Population Trend ^{historical fluctuation}

The frequency of O'Rilley has changed over time. In The United States the number of people carrying the O'Rilley last name fell 42 percent between 1880 and 2014 and in England it fell 75 percent between 1881 and 2014.

O'Rilley Last Name Statistics ^demography

The religious adherence of those holding the O'Rilley last name is predominantly Catholic (100%) in Ireland.