From The Collaborative International Dictionary of English v.0.48 [gcide]:
Bon \Bon\, a. [F., fr. L. bonus.]
Good; valid as security for something.
[1913 Webster]
From The Free On-line Dictionary of Computing (8 July 2008) [foldoc]:
bon
<language> (From "Bonnie", Ken Thompson's wife) A language
designed by Ken Thompson and later revised by him to produce
B.
[When? Features?]
(1997-02-04)