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The game was developed primarily by Namco employee Toru Iwatani over eighteen months. The original title was pronounced pakku-man (パックマン) and was inspired by the Japanese onomatopoeic phrase paku-paku taberu (パクパク食べる)

For the North American market, the name was changed from PUCK MAN to Pac-Man (actually closer to the original Japanese pronunciation) because puck was similar in spelling and pronunciation to a common expletive, and vandals could easily change it.

http://en.wikipedia.org/wiki/Pac-Man