Miqo'te naming conventions for different Seeker tribes

[ItMe]

Pretty sure it would depend on the dad.
If he's a 'tia vs a Nunh.
If he's a 'tia I imagine he takes the mothers name.
If he's a Nunh I'd bet he takes after the big shot Nunh at the center of the tribe.
Though, I have the Eorzea Encyclopedia and looking through it... it doesn't seem to have a hard answer for you.
It acts like each tribe and each race stays oddly segregated (like how there are no "half-elves" on Eorzea, or half dunesfolk).
Just go with whatever is most fun for you.