First cited to 1924.
Although often described as wasei eigo (和製英語), this appears to derive from English phrase salaried man, which appears in print at least as early as 1828.
The resulting Japanese term was then re-imported into English.
Analyzable as サラリー (sararī) + マン (-man).
- a salaryman (male office worker)
- (shortening) リーマン (rīman)
- サラリー (sararī)
- Entry at Gogen-Allguide (in Japanese)