would you advocate names like Adelaide, Virginia, and Carolina on boys? They're place names derived from female names.
People don't really use March and July anyway. The well-established month names are April, May, and June, and the latter two come from goddesses (debatably; maybe the goddess Maia and the god Maius are kind of the same figure?).
I really cannot see August on a girl, personally. Too many wikipedia articles and history classes with stompy masculine german/germanic Augusts in them. It gives me shivers on a girl, like Julius or Franz would.