Y's used to be a cool way to be original, but it seems now they are quite common. Y's can still be cool, though, and often are in my opinion as long as you don't overdo it. And don't think you're original, cause you're not
EE's... one of my cousins's kids is named Charlee. She's a girl, too... which reminds me of boy names being used for girls and vice versa. Ice T's name is Tracy because his dad wanted him to grow up tough, just like the Johnny Cash song Boy Named Sue (although he didn't write it, and Sue actually sounds badass, although I wouldn't name my kid Sue).
You can get away with EE's if you are french, such as Aimee.