More family tree work. I've noticed several female relatives named Clyde or Clide. Once or twice it might be an error, either in what their gender is marked down as or in the name being misheard/misspelled. Though what it would really be, I have no idea. But now that it's happened maybe five times with different people, I'm beginning to wonder if Clyde was actually considered a female name at one point.
I just checked "Behind the Name" and there was a low but steady trend of Clyde as a female name in the late 1800s/early 1900s. Apparently it originated from the River Clyde in Scotland, so maybe people thought of it as a nature name at first.
Another one: a guy born during the Civil War era, whose name was Lily. He appears on a census very clearly as male--married to a woman and listed as the son-in-law of the head of the house (he and his wife are living with her parents). And I looked at the original form and it sure does look like Lily, as opposed to something else rendered in bad handwriting. Behind the Name did not have anything about that ever being a male name. But, I've heard of it as a surname--like Evangeline Lilly--so maybe that was its origin.