No Alternates Allowed! (girls, 2013)

Yay! I can't guarantee all these names are immune from "um, how do you spell that?", but they at least have no spelling variants currently in use (well, none that were given to 5 or more girls, anyway).
(Top 1000 only, from most to least common)

• Harper
• Hope
• Iris
• Parker
• Amanda
• Ruth
• June
• Elle
• Alejandra
• Sawyer
• Guadalupe
• Maeve
• Eve
• Fernanda
• Gloria
• Virginia
• Hattie
• Regina
• Beatrice
• Brenda
• Juniper
• Paola
• Willa
• Alma
• Paloma
• Monroe
• Martha
• Salma
• Joyce
• Paulina
• Heather
• Paula
• Abril
• Lara
• Dixie
• Luz
• Ingrid
• Belen
• Shannon
• Liv
• Meadow
• Estelle
• Magnolia
• Princess
• Astrid
• Charity
• Judith
• Tess
• Esperanza
• Louisa
• Antonia
• Joelle
• Clementine
• Milagros
• Beatrix
• Etta
• Pamela
• Cordelia
• Louise
• Alessia
• Ariadne