I believe the name is a play on a) romanization of the Japanese pronunciation of PC ("personal computer" -> "PersCom" Japanese abbreviations of English tend to

I believe the name is a play on a) romanization of the Japanese pronunciation of PC ("personal computer" -> "PersCom" Japanese abbreviations of English tend to concatenate the initial syllable of every word, and "n" and "m" end up sounding very similar). b) "parser combinator" would have the same abbreviation in Japanese