There are as many as 200 different varieties of chiles that have been identified give or take a few. New ones are being devleoped by plant geneticists all the time, plus chilies freely cross pollinate so you can see the almost impossibility of definitively identifying a random pepper. As Lizannd said, Serrano was my first guess, followed by Fiesta, but it could really be something different. Why not ask some local vendors/growers what they call it.
Have Fun & Enjoy!
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