As a Brit, I'm not surprised, it's very much a trend here.
I know/know of girls (all aged 10 or under) named Betsy, Dolly, Nellie, Betty, Dotty, and Flossie. And these are the given names.
It's not a new thing either, there are girls at my school (age range of 13-18) named Elsie, Bess, and Minnie.
~Charley~
https://www.behindthename.com/pnl/184785