Though I don't know the exact meaning and of course both known bearers were female, I don't think there is a reason why Finduilas couldn't be a boys name - Fin appears in many male elf names , then we have Thranduil and Legolas ... far less odd than David Cameron calling his son "Elwen".
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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