Germanic
unisex names.

Within the Germanic unisex side specifically, Charlie, Aubrey, and Billie are the most-used in the U.S. record — a useful three-point sense of the register, since the rest of the list mostly varies between rarer literary, religious, and modern coinages.

This page shows 4 Germanic unisex names sorted by U.S. SSA totals — so the most-given names sit at the top and the rarer entries toward the bottom.