Irish Travellers , Anglo-Irish , Bretons , Cornish , English , Icelanders ,  Manx , Norse , Scots , Ulster Scots , Welsh
The Irish have their own customs, language , music , dance , sports , cuisine , and mythology. Although Irish (Gaelic) was their main language in the past, today the huge majority of Irish people speak English as their first language. Historically, the Irish nation was made up of kin groups or clans , and the Irish also had their own religion , law code and style of dress.
In its summary of their article 'Who were the Celts?' the National Museum Wales notes "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early studies have, so far, tended to produce implausible conclusions from very small numbers of people and using outdated assumptions about linguistics and archaeology."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. [ citation needed ]