Ack
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So is Medusa. (She was one of the Gorgons). But that has a plural, because it's been used as a name for a type of jellyfish.Plural of Pegasus is nothing because Pegasus is a proper name, not a species.
Thus, once something gets used as a name for something of which there is more than one, there is a plural for it. The generally accepted plural is "pegasi".