Ibérico in this case doesn't refer to the place of origin (Iberia) but the type of pig (Black Iberian).

https://en.wikipedia.org/wiki/Jam%C3%B3n

Non-Ibérico ham is usually called "jamón serrano".

So logically, ham made in Texas from Black Iberian pigs could be called Texan Iberico. But I like the ring of "jamón tejano" -- I would certainly buy that! (Texas has a positive halo effect when it comes to meat products)