If you're referring to the cookies eaten during Purim, they're called either Oznei Haman (Haman's ears) or Hamantashen (Haman's hat).
There is no such holiday called 'Haman'. Haman is a character in the story of Purim.
Hamentashen are little triangular-shaped pastries which we eat on Purim. In Hebrew, they're called Haman's Ears, in a mocking reference to the villain in the Scroll of Esther.
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Oznei Haman in Hebrew or Haman tashen in Yiddish. the shape of the Oznei haman is triangle a little cookie that has some jam of poppy seeds in the middle common food for Purim. By Holly Rusher
Purim comes from Pur which means "casting lots" which is what Haman did to decide what day the Purim massacre would be on.Source: Esther 9:26 - Wherefore they called these days Purim after the name of Pur.
If you are talking about the story of Purim, the villain, Haman, was identified by Esther, and the King had him and his brothers executed, instead of the Jews.
Because Haman cast lots to see when he might succeed in getting the Jews killed.
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trick question, it doesnt say, but it does mention his father, Hammedatha.