Jasbo, Jazzbo derived from jasper=strange guy

[Arnold Zwicky]

dale coye suggests an r-less source of jasbo/jazzbo from jasper.
possibly, but there's also the nickname suffix -bo as a possibility.
(what does anybody know about *this*?  is it related to "boy"?)  jimbo
for james/jim is well attested (Rebel Without a Cause comes
immediately to mind), but i've heard some others, like robbo, timbo,
and herbbo.  the question now is: how long has this suffix been
around?  as long as a hundred years?

arnold (zwicky at csli.stanford.edu)