Marihelen
I was called Lizzie Dripping by my family and schoolfriends, (in the 1940s/50s) long before the Helen Cresswell books were written, but I don't know where the name came from. Strangely if you go to the website given by madpants and look at the photo of the actress who played Lizzie Dripping, I used to have my hair like that too.
I used it as my name on here for some time, until I found there was another Lizzie Dripping, but I think she had quotations marks or some slight difference. Anyhow, I changed to Lizzie Not So Busy instead, although if you look at my profile (which I presume you did) it shows my user name as Lizzie Dripping.
Lizzie