Hello Fish...
Doesn't look like any I've seen. Possibly a hybrid of some kind. I've heard of Dalmation Platys, like Dalmation Mollies. Doesn't matter, it looks like a nice, healthy fish. I keep "Livebearers" too. They're fast breeders in pure water conditions. So, keep the water clean with lots of frequent, large water changes. It wouldn't hurt to add a bit of standard aquarium salt to the new, treated tap water. A teaspoon for every 5 gallons should do. My fish seem to prefer it. Just a suggestion though. You're the "chief water keeper".
B