You need to ask the breeder. Fancy swordtail crosses like that are named by their breeders to promote fish sales. That fish is gorgeous but each breeder gets to name the strains they develop.
i would just guess a koi swordtail. to be honest, unless this is a true-breeding line that only produces fish with very similar coloration to this one, there really isnt any way of telling hat kind of swordtail it is or will produce.