Valmai used to be used in South Africa as well, also for no apparent reason! It doesn't run in families, but suddenly it pops up. I know a woman in her late 60s who is Valerie but whose parents seriously considered naming her Valmai (which they pronounced Valmay. I take it Valmai would have a -my sound rather than a -may?) instead, though they were both Afrikaans and must have just liked the "sound" (or the look) of it. And I know of an Afrikaans girl who must be 20 by now who was named Valmy. That looks French-geographical, but in Afrikaans the y makes an -ay sound, and her name sounds like Valmay. I've also seem Valmae. It's also been noted in New Zealand, if I recall. And it is a puzzlement!