According to Farouk in Uncanny X-Men #265, Storm was promised to him long ago, but since Claremont wrote this in 1990 we've had no concrete evidence with regard to who this might have been.
I'd always wondered "had one of her Rain Queen ancestors promised N’Dare’s child to him?"
Think I've now figured it out!
It very possibly was Storm’s uncle, Shetani (who was established in the UXM Annual in 2006).
It was revealed that the males within the family bloodline did not receive any of the power passed down so he sought a different sort of power to destroy theirs and had been hunting for Ororo for years.
It is very possible that he made a deal with Farouk in exchange for power of some sort in the past… which would give N’Dare, her mother, more reason to flee with her child.