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Gaelic does mean irish-celtic lol
This is wrong. Look it up. The rest of your post isn't relevant but I'll reply to it anyway.
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the celtic tribes that havnt originated in ireland are the welsh, the manx(isle of man) and the cornish tribe whos name i can no longer remember
Also wrong. Just please. Research
and try to understand the basic concepts,
then the details. You'll learn alot more that way.
Protip to get you started: Celtic culture is widely believed by historians to have originated in continental europe.
But none of that is relevant. The bottom line is Gaelic isn't a word that means irish-celtic.