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Re: Origin and meaning of unusual name...
It depends on when your great-grandmother was born, but Briony and Bryony don't seem to have been used as Victorian names at all, so I'm not sure the other posters are right. I found a couple of Brinnies in the England and Wales births, marriages and deaths, one in 1888 and one in 1902. Both of them were born in Wales, where there were several female variants of Brynmor (a male name), like Brynwen and Bryngwyn and Bryneg. Brinley was a popular male name in Wales, too. Of course none of this may have any connection with your Brinnie!
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I'm also sceptical of the Bryony theory for the same reason. I can only do free searches on Ancestry but it doesn't look like it was much used as a name anywhere before the mid 20thC. Cleveland Kent Evans is the expert on trends though. The Welsh idea seems more plausible to me, but I suppose only if this Brinnie had Welsh ancestry. I can't find any plausible Scottish names.
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