Percy's real name, Perseus, is used by many of his enemies and many gods in the Percy Jackson and the Olympians series. In The Heroes of Olympus, he is mostly addressed as Percy, with the exception of The Blood of Olympus, in which he is referred to as Perseus by Polybotes and Kymopoleia.
-Percy never revealed his real name to his friends prior to Camp Half-Blood.
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Fandom Facts you may not know
RandomLe facts you may not know about your fandom Also some theories from time to time.... And headcannons..... (Don't ask me for sources b/c I find most of these facts on random websites I stumble upon)