Also American, and it's been since my great grandparents that my family line has been elsewhere. Technically, I have Irish and Ukraine (and Lithuanian) in me. Good luck finding any of those civs in the game...though Ukraine would be closest to Russia in the game..Although since it's technically not Russia you can make a case for most civs based on Eastern Europe... (and Ireland would be England I guess).
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I could be mistaken, but I thought Celts were related to Irish. Or are they Welsh?
Not really familiar with that part of the world.
In ancient times the Celts populated Iberia, France (then known as Gaul), Northern Italy, parts of Germany, areas north of Greece, the British Islands, and even some parts of Turkey. This was until they were conquered and assimilated by their invaders, the Roman Empire, and then later the Germanic tribes. Today the nations associated with the Celts are, Ireland, Scotland, Normandy, Wales and the Isles of Man.
As for England, that is more commonly associated with Anglo-Saxons, who are Germanic. But I am sure they must have absorbed the indigenous Celts and Romans settlers of Britannia into their bloodlines.