View the most religious surnames in Ireland

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

O'Nill occurs in Australia more than any other country/territory. It can appear in the variant forms:. For other potential spellings of this last name click here.

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

This last name is the 7,117,718^th most prevalent family name on earth It is held by approximately 1 in 1,041,077,988 people. The last name is mostly found in Oceania, where 86 percent of O'Nill are found; 86 percent are found in Australasia and 86 percent are found in Australia and New Zealand.

The last name O'Nill is most commonly used in Australia, where it is borne by 6 people, or 1 in 4,499,284. In Australia O'Nill is most common in: Queensland, where 50 percent are found and Northern Territory, where 50 percent are found. Barring Australia it exists in one country. It is also common in Ireland, where 14 percent are found.

O'Nill Family Population Trend ^{historical fluctuation}

The incidence of O'Nill has changed through the years. In Ireland the number of people bearing the O'Nill last name declined 96 percent between 1901 and 2014.

O'Nill Last Name Statistics ^demography

The religious devotion of those carrying the O'Nill last name is chiefly Catholic (100%) in Ireland.