I like it. I love Fionn, which could be a nickname in this case. I've been really liking Finlay/Finley lately. I'd spell it that way because in the US people would be afraid of Fionnlagh. So I'm not sure how it would fare in the UK. I suppose Scotland could handle it. And Northern Ireland. :) I might consider using Finley, but it's been becoming more popular here... possibly to the trendy point. Sadness.