Interesting that "Craic" has now been accredited as a word of Scottish origin (I was told this by a friend who is an eminent Irish archaeologist!).

He also enters into the debate on musical origins and makes the point that the movement of Scots to Ireland and vice-versa has been occuring for over 10,000 years. There is now evidence for the first settlers to the island that is now Ireland (since the last ice age) having gone over from the area of Britain that is now known as Scotland. Since then, there has been a constant movement of people of all social classes between the two countries.

The other thing that makes it so confusing is that many of the people in North America who are probably of Scottish origin think they are of Irish origin as a lot of the boats last port of call was in Ireland to pick up fresh water, regardless of the original origin of the boat. Apparently, when the ship arrived in the USA the people would all be listed as coming from the last port of call if they couldn't be understood.