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I like Finn a lot. I think it is fine as a full name, but I would use it as a nickname for Finlay. I also like Finnick as a guilty pleasure!

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I would spell it Finn, as I think people might pronounce Fionn wrong and/or assume it was spelled Finn as it is the more usual spelling. Fynn looks awkward to me, although Flynn is not too bad.

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I don't think Finn is trendy, but Fynn is.