Oedipus Rex is a classic Greek epic, so it makes sense that his name would come from the Greek language. According to Wikipedia, Oedipus means "swollen foot" and originated from the Greek word "Oidípous".
In Greek mythology, Laius, king of Thebes, consulted the oracles and was told that he would have a son. This son was going to kill him. ... The name Oedipus means “swollen feet”.
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