When my cousin got pregnant with her second child, the boy name she wanted was the same as my son's. It's an old fashioned family name, and I was a little taken aback, but she had enough going on in her life at the time, so of course, I didn't make an issue of it. On the maternal side of my family, we cousins are as close as siblings, and our children are also very close, so it would have been a little confusing at times, but no big deal.
Then, she found out she was having a girl. The name they chose? The very same unusual name we had picked for a girl when we were expecting Son! I love the name, and I was tickled that I obviously have such good taste.
(She did choose a different middle name, however, and the entire name is beautiful.) I can't remember if I had ever told her what our "girl" name was, but I am thinking they came up with it entirely on their own.