Quilla, var. Quylla, means "feather". Quilla is unconventional as a given name.
Quinn▲, var. Quin, Quincy, Quincey, means "counsel". The name Quinn has grown progressively more popular with parents since 1880-1889. Unisex name.
Quincey, var. Quincy, Quinci, Quinsy, Quincie, means "estate of the fifth son". Also suitable as a boys' name. Quincey is unconventional as a feminine name, appearing commonly (Top 69%) as a last name according to the US Census.
Quintana. Not generally used as a name for baby girls, Quintana is found more often as a last name. See also Quintina.