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Fionn is the Irish form of the name modernized as Finn, but popular in this form in Ireland, where it's in the boys' Top 20. A couple dozen baby boys in the US were named Fionn last year and no baby girls, though there were girls named Finn, Fionna, and Fionnuala, so Fionn may be thought of as a variation or short form of those names.

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Fionn, the modern Irish form of Finn, is more popular in Ireland these days than Finn, which is rising fast in the U.S. where Fionn is virtually unknown.  That's probably a good thing, because few Americans would know that Fionn and Finn have the same root and are pronounced the same, like the fin of a fish. It's the namesake of a great hero from Irish mythology, Fionn MacCumhaill, who acquired divine wisdom by eating an enchanted salmon of knowledge.

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