The UK Office for National Statistics has some data about names. The baby name explorer is mildly frustrating because they let you look for either boys names or girls names but not both at the same time. And for boys the only spelling is Ashley but for girls the only spelling is Ashleigh. For girls you're not allowed to enter George, only Georgia or Georgina.

Baby name explorer: https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...

Baby names for girls: https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...

Baby names for boys: https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...

I get the impression that George as a male name took off because of one of the royal babies.