the number one name Black parents applied to their baby girls was Madison, a name historically and traditionally given by White parents. "Traditionally", names like Madison were handed down as surnames or middle names, NOT first names. To the degree that names like Madison were used as a first name, they were given to boys.
Morgan is another popular girls' name. But as recently as the '70s, it was a man's name. Here is the 1970s comic book character Morgan Edge:
And right now, the black version sporting this "girls'" name.
Stories about frequency of naming are pretty much obsolete, as so many mothers, especially black OR white unwed mothers are just pulling names out of the Scrabble bag:
LaQeeshah
D'whanna
Jusstiss
etc.
In California, some massive number of names (more than 20% despite a large Hispanic community that doen't do this) have one of a kind names.