If it's in the U.K., I have it (plus a fraction of Bavarian German). My grandmother was Scottish, born on the Mull of Kintyre that McCartney sang of. Of the counties in Northern Ireland, the only one I haven't found any definite ancestry in is Fermanagh. However, for some ancestors, the birthplace on the census or other records is only "Ireland", which is too vague. I know it's North, but not where. At the other extreme is "Bleachgreen, Londonderry", which is a pretty definite location!
As for what makes me Irish-I haven't been there, true. We're talking pretty far back, too: all the Irish in my family emigrated during the first big wave of the mid-1700's, a century before the potato famine. Many of my family pretty hastily beat it to Canada after the Revolution, and my parents were the first generation born in America. That's a long way of saying that going by length of time in a location and recent ancestry, I should have stronger ties to Canada than my own country or Ireland.
I know this sounds very woo-woo, but listening to "real" Irish music (not the Americanized forms) or just seeing pictures stirs some kind of ancestral pull or voice. It's a sense of something familiar. I think my father (of Scottish mother and Irish father) also felt that pull. He would sing of the mountains of Mourne to me with such emotion, atypical for him. He got to go back to Scotland but not to Northern Ireland for obvious reasons, so I will go.
Sorry for length, and I hope that's what you were asking for
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