Erica,
Michelle,
Dawn,
Christine,
Kristin, Kimberly(Kim), Jessica(Jess,
Jessie),
Donna,
Amanda, Kristy/Krista/Crystal,
Dolly,
Daisy,
Sandra (
Sandy),
Linda,
Rhonda (
Ronnie),
Amy,
Melissa,
Tiffany,
Stacy,
Summer,
Virginia (
Ginny),
Winona.
I realize some of these might originally have been derived from another culture (Michelle=French name), but they have become so firmly entrenched in American naming trends that they can be considered American. (There are very few American names that aren't derived from some other culture/religion etc.)