Perhaps Ishuäl birthed the Dûnyain the way the Ark birthed the Inchoroi.
At that point, why don't we just say that Ishual/Thousand Thousand Halls IS the Ark, and the Horns broke off and landed farther north than the rest of the ship.
The Dunyain are a forgotten weapon race, which is why the Inchoroi twins are so obsessed with finding them.
At this point it could go either way. Which is interesting because that is one of the main issues in interpreting Plato's Republic because it allows for both gender equality or gender subordination...
And then based on Dune:
Bakker could riff off any of the Bene Gesserit, Honoured Matres, or axolotl tanks (broodmare scenario). Personally, I'm hoping for the Dunyain/Bene Gesserit/Philosopher-Queen scenario.
Twist: There are no Dunyain women, they harvested from some kind of gross tree with babies growing in liquid filled sacks.
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You should check out that thread

. Note that we have never seen a Dunyain woman. Say no more due to spoilers, there are those here that have began the Dune saga and have not yet finished.