Hera
Echo is a nymph in Greek mythology. She once had the job of distracting Hera from Zeus having relationships with other women. She did this by leading Hera away and flattering her. When Hera found out she was very angry with Echo. She put a curse on her that meant that she could only speak the words of other people after she had heard them. It is due to this story that we get the meaning behind the word echo.