I think my problem with
Fenella is the "
Fen" part, because it reminds me of a bog or something. Also maybe fennel, although that's not necessarily bad. It reminds me of Morella (along the lined of fennel and morell mushrooms... odd plant names with "ella" on the end). I don't think it's super old-fashioned/dated sounding like
Prunella, but it's a bit too quirky for a modern kid. I'd like it for a character though.