Irish Celebrity Girl

The author Jim Webb suggests that a large number (he suspects near half) of those claiming Irish-American ancestry, especially among Protestants, may be Scots Irish (that is, descendents of Scottish people who populated the Irish province of Ulster)
Origins and antecedents
In its summary of their article 'Who were the Celts?' the National Museum Wales note "It is possible that future genetic studies of ancient and modern human DNA may help to inform our understanding of the subject. However, early studies have, so far, tended to produce implausible conclusions from very small numbers of people and using outdated assumptions about linguistics and archaeology." Nineteenth century anthropology studied the physical characteristics of Irish people in minute detail