Thanks for that - I wondered if 10a might be Okolo - ok+(p)olo, but the stuff that comes up on t'internet doesn't seem relevant - I've tried onelookdictionary as well, but that didn't help.
But your link wasn't there when I answered - and I do know about Harriet Beecher Stowe (I was a librarian in a previous life), but I'd got the idea stuck in my mind that "she" was going to be part of the answer!