Source: http://en.wikipedia.org/wiki/Koffing_and_Weezing#Conception_and_characteristicsTheir names are plays on the words "coughing" and "wheezing", meant to related to symptoms caused by the noxious fumes they emit. Originally, the characters were intended to be named "NY" and "LA" respectively in English localizations, intended as homages to the heavy pollution of American cities New York City and Los Angeles.