And to get the answers, cartographer Kenneth Field and the American Geographical Society have shared an interactive map of Ireland based on the 1890 census that stunningly and intuitively illustrates the density and origin of over 1,000 Irish surnames.

This brilliantly detailed map of Ireland lists over 700 traditional Irish surnames in the counties of their ancestry.Trace your Heritage on this Ancestral Map of Ireland. Locate the roots and lineage of your family name in counties such as Derry, Dublin and Cork.

Below is the interactive map of Irish Surnames. You can download a print copy here. The Irish surnames on this map have either historic or numeric importance to the counties of Ireland. Indigenous Irish names beginning with O', Mac, Mc, De, Le, and others indicate historical significance.

This Irish Surnames Map details the precise origin of the estimated 4,500 Gaelic Irish, Viking, Norman and Scottish Gallowglass surnames. Each surname is positioned in the location where farmers with each surname concentrated in early census data.