Considering The Clone Wars is canon and considering what we learned about Obi-Wan and women during that series, I like to think he wouldn’t have any children.
Trying to keep spoilers to a minimum there.
To that end, I prefer her being a random. But at the same time, we definitely know there’s some sort of destiny at play here. Parents don’t generally just ditch their kid on a desert planet full of horrible people for funsies.