By 'cutesy' so you mean with the 'ee' sound at the end?
All these are outside of the top 300 (I think):
Allie, Bessie, Betty, Billie, Brandy, Becky, Cassie, Callie, Carrie, Carly, Dulcie, Eilidh, Effy, Fanny (don't!), Ginny, Gerri, Halle, Hadley, Izzy, Julie, Jodie, Josie, Kiki, Kirsty, Keltie, Kristie, Kylie, Kerry, Kelly, Kezzie, Lindsey, Mattie, Minnie, Mindy, Minty, Misty, Macie, Mercy, Miley, Nikki, Penny, Polly, Peggy, Patsy, Pixie, Ryleigh, Romy, Sally, Saffy, Sandy, Tammy, Tansy, Vikki, Verity, Wendy
A lot of them aren't really standalone names though!