</What does the word nittel mean?>
Nittel comes from the word nitleh, the hung one, from toleh.
When was he killed? The gemora sanhedrin says 1st day pesach (though all drawings of ‘The Last Supper’ show large round matzos -a big kushya!) The goyim say that he was born on 25 Dec. Seforim write that actually he was a mamzer as we know, and therefore his birth was obviously kept secret so nobody knows the date of his birth. However they chose 8 days before their new year to say he was born on 25 Dec. so that his bris would have been on new year day so they celebrate both days when he would have had a simcha.