Are you REALLY Celtic?

[gilmore]

...
Gil, I just know you are going to be able to sort this out.

It's not really in need of sorting out.

As you know, your Y DNA follows your patrilineal ancestry---your father's father's father's father, etc.---There are many of us who descend from both the Celts, (whose Y DNA is usually R1a) as well as the Norse, who invaded and settled in the north of Scotland and the Hebrides.

Edit: Ooops, the most common Y DNA haplogroup among the Irish, Welsh, and Scots is R1b, not R1a. It is thought to have come up the Atlantic coast to the British Isles from the Iberian peninsula after the last ice age, where it developed.

The further back in time we go, the smaller percentage of our total ancestry our Y DNA represents.