What was Norm's last name on the American TV show "Cheers"?

"Cheers" is an American sitcom that ran on NBC from September 30, 1982, to May 20, 1993, with a total of 275 half-hour episodes spanning over eleven seasons. The show is set in a bar named Cheers in Boston, Massachusetts, where a group of locals meet to drink, relax, and socialize. The show's main theme song, written and performed by Gary Portnoy, lent its refrain "Where Everybody Knows Your Name" as the show's tagline.

George Wendt portrays Norm Peterson, a bar regular and occasionally-employed accountant. A recurrent joke on the show, especially in the earlier seasons, was that the character was such a popular and constant fixture at the bar that anytime he entered through the front door everyone present would yell out his name ("NORM!") in greeting; usually this cry would be followed by one of the present bartenders asking Norm how he was, usually receiving a sardonic response and a request for a beer.

He has infrequent accounting jobs and a troubled marriage with (but is still in love with and married to) Vera, an unseen character. Later in the series, he becomes a house painter and an interior decorator. The character was not originally intended to be a main cast role; Wendt auditioned for a minor role of George for the pilot episode. The role was to only be Diane Chambers' first customer and had only one word: "Beer!" After he was cast in a more permanent role, the character was renamed Norm.