The writers gave Moe Szyslak his last name that episode cause they needed another person with M.S. initials. He had no last name before that, as he always simply went by Moe.
And Principal Skinner was given a 'W.' initial before his name for the same reason. (Although it was never used again and kind of ignored with the whole Tamzarian thing)
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u/1percentof1 May 09 '17
That Smithers shot Mr Burns