I got the book today (m)
in reply to a message by Pie
The girl's name is Cooty in the book. I don't know why it was changed to Coopy in the film. They are both very odd names!
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Thanks for posting, it's great to have the mystery solved at last. It is a very odd name! I'm guessing that maybe the association with 'cooties' - which as a term for lice, seems to have originated in WWI - was probably general enough at that point to make the name seem a bit awkward to the script-writer for a little girl.