I think the first order of business is to define what, precisely, we mean by "Celtic". Generally, Celtic refers to a group of related languages, and the cultures that developed in the communities that spoke those languages. So, being Celtic would have nothing to do with genetics or blood, but by being part of this cultural grouping.
The CR FAQ lists the languages considered Celtic, which is a much longer list than most people consider Celtic. So, what Celtic cultures do we want to focus on here? Irish, Scottish and Welsh are the big three I hear mentioned often- who else?
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