I actually think the first chart is most telling. Since they are ordered by popularity, the names which had a visible male presence (Kelly, Kim, Riley, Avery) a

I actually think the first chart is most telling. Since they are ordered by popularity, the names which had a visible male presence (Kelly, Kim, Riley, Avery) are what I would call 'switched'. Most people would have identified those as masculine at one point. Many of the others are too obscure to most Americans, so they would not have a preconceived gender attachment.