edit: I didn't realize Pac Man was originally "Puck Man" in Japan. I added a note to the article.
Artic just copied the original Japanese name. Pretty lazy:
"The only differences between Artic's Puckman game and Midway's Pac-Man game are (1) the names of the ghost characters in Artic's game are different from the names of Midway's characters, (2) the Midway copyright notice does not appear on Artic's game, and (3) the name of the game is different. Other than those trivial differences, the Artic game is absolutely identical to Midway's Pac-Man video game described above. In fact... Artic's Puckman printed circuit board contains an error common to Midway's Pac-Man game." http://scholar.google.com/scholar_case?case=3162513435280413...