Female versions of male names

[bassingtonffrench]

In an idle moment I was thinking if our expected boy turns out to be a girl, would I be prepared to use the female version of the male name we have chosen.

But in most of the examples I could think of, the female version is now far less popular than the male version e.g.

Louis is really popular, hardly any Louises these days
Loads of Maxs, not many Maxines
Michael still a current name, but Michelle isn't
Jack is everywhere, but Jacqueline isn't

An exception would be Olivia and Oliver, which are both very popular.

So, my question is, are female versions of male names less popular these days and if so why?

[BlueChampagne]

My great great aunt was Jamesina (Scottish again).

[Bumbershoot]

Francesca! Frankie for short.

[fussychica]

Robyn or Sidney.

[AFishCalledBarry]

Erica isn't a female version of Eric. It's a type of heather and much nicer than Eric

[BlueChampagne]

Alan / Alana

[WWOOWW]

Shauna / Shaun - Sean