One of my great-grandmothers had a middle name that is definitely a boy’s name or surname (and afaik always has been).
I’d always assumed it was her mother’s / grandmother’s maiden name. But I’ve recently traced that line of the family and there seems to be no family connection to the name whatsoever - the name doesn’t occur in anyone else in the family that I’ve traced, as surname or as given name.
As far as I can tell she was legitimate - born around 10 months after the wedding - so presumably not some kind of paternity issue.
Any ideas? The family otherwise have completely conventional names of their time, so it definitely stands out! Or was there some kind of 1860s fad around using male names for girls?