Yes,
Douglas was originally a female's name. We actually had a discussion about this name some time back, when
Daividh challenged the board to come up with a popular masculine name that was at one time more popularly found as a feminine name. (In retaliation for all the popular feminine names one finds today which were appropriated from the male gender).
Can't find the thread, unfortunately. 10 points to whoever can find it in the Archives.
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Nanaea