TV Sitcoms

Which "Big Bang Theory" character's last name was not revealed once in the show's first 8 seasons?

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What is the nickname of doctor Percival Cox on "Scrubs"?
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In which season of "Married With Children" did Buck die and Lucky appear?
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On "Seinfeld", how long did the Soup Nazi suspend Elaine from eating his soup?
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Complete the name of the TV series, "Master of ___"?
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On "The Drew Carey Show", who played Lewis?
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On "Friends", which character wants to see Chandler's thing?
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