Are there others with one Homo mermanus parent and one Homo sapiens parent? Or is Namor the only hybrid between the two?

I know it's simple, but I've just started reading some old Sub-Mariner comics and what I've seen there and online doesn't seem to indicate any other hybrids and the level of distrust among the Atlanteans for humans seems so high, I'd think the number of children with one parent from each world would be almost non-existant.