That name (and the identity behind it) was fabricated by Iron Crown Enterprises for the "Middle Earth: The Wizards" card game. It is certainly not canon, and most Tolkien enthusiasts disregard it.
Noting that Tolkien describes them as "Kings of Men" and the small role of women in governing the lands of Men in Tolkien's works, it is fairly safe to assume that all of the Ringwraiths are male.
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