My parents named me an unusual name and it definitely made my life so much harder, especially since it's impossible to shorten.
If you like the nickname, that's fun and great, because nicknames are easy to change and casual. But birthnames that are legal and unusual... that changes a lot.
Kids can be teased unmercifully, always feel different, and oh my god - the number of times I've had to repeat myself or spell it out for people. You get these awkward looks like it's your fault you were given an unusual name. People always want to know why I have an unusual name, and they seem confused when I say, "My parents just liked the name." They blink at me like, that can't be right - why would anyone give you an unusual name unless they had a good reason?
And don't get me started on coffee shops. They ask for my name. I say it. They look at me like they just don't know what to do. So I say, "Sarah. My name is Sarah. Whatever. Just write Sarah!!" I just make it up so I don't have to explain myself.
To be clear, my name isn't terrible. It's absolutely on par with Lennon. Something that is only a little unusual. But every day I hate that my parents named me this name instead of something normal.
Like others have said before, can you name her something else? Could even be a classic name that is a little out of style if you want her to be "special"? You can always go wild on the nickname. As wild as you want. Nicknames can be anything.
But do consider the frustration of your child in the future on something she has no control over. Names really do make a difference.