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Can you post a picture? Perhaps a hybrid of a molly and swordtail? I can find red eyed sailfin molly, and swordtails but not a red eye swordtail molly.
Looks like a lyretail. The "red-eye sailfin" part just describes its color and finnage, not a specific species or anything. There are too many hundreds of color and fin variations to bother looking it up, its very hard to find specifics.
That doesn't look like a molly. It's a lyretail swordtail. Females will have similar extended fins but lack the large swords on the caudal fin. They can be difficult to breed because the male's gonopodium is elongated as well.