I love the name! I love the way it's spelt - Macey - But I also love it spelt - Macy. Macey is such a great name and I would recommend it for a pet if you're not planning to name a human this name. I named my hamster Macey and it's so cute! But I believe Macey and a human's name would be so good. Hope this helps :)
My little sister's name is Macey, and I've never ever come across any other Macey's (not even Macy's!) where I live. I think this is a very feminine, cute, and fresh name. It's great that not many people have it, that makes it unique and new. :) Without the 'e', it reminds me of the store Macy's, so I prefer the spelling with the e.
I heard the name Macey and thought it was really pretty, I have all boys and am not having kids any more so when I got a bird I used that name for her.