Naming has a long history in kabbalah-oriented texts, especially among the chassidei ashkenaz of 800 years ago. As time went on, it accrued more and more mystical significance, especially among the chassidim after the 1700s. In the past few generations, and still today, it has attained the status of mythical, life-defining proportions. In my opinion, this emphasis has been exponentially exaggerated and needs to be put into normal perspective.
It is ok to name a male after a female and a female after a male. One name is ok, two is ok, three is ok, and so on. The name does not determine the future of the child. One should name a child with seichel and consideration for others. Past that, it doesn’t really make a difference.