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It's Kelt, and C is always pronounced like a K - except in the case of the Scottish football team Celtic FC, which is pronounced Seltic. No idea why! And Celyn is KEL in - y in the last syllable sounds like a short i.

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We did have Ks until the 16th century, when there weren't enough of them to print the New Testament in Welsh, so Cs were used instead and became standard. So they say. :)