View the most religious surnames in Ireland

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

O'Nil is found 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'Nil? ^{popularity and diffusion}

The surname O'Nil is the 7,593,402^nd most commonly occurring family name throughout the world It is held by around 1 in 1,214,590,986 people. The surname O'Nil is mostly found in The Americas, where 67 percent of O'Nil reside; 50 percent reside in North America and 33 percent reside in Anglo-North America. It is also the 4,548,448^th most frequent first name globally, borne by 7 people.

The surname is most widely held in The United States, where it is borne by 2 people, or 1 in 181,229,466. In The United States O'Nil is most prevalent in: Delaware, where 50 percent live and Missouri, where 50 percent live. Barring The United States this surname exists in 5 countries. It is also found in Brazil, where 17 percent live and Canada, where 17 percent live.

O'Nil Family Population Trend ^{historical fluctuation}

The incidence of O'Nil has changed over time. In The United States the number of people who held the O'Nil last name contracted 60 percent between 1880 and 2014.

O'Nil Last Name Statistics ^demography

The religious devotion of those carrying the O'Nil surname is predominantly Catholic (100%) in Ireland.