This old article from 1989 backs old-computers.com's statement up
This site, however, lists ST denoting SixTeen and TT denoting ThirtyTwo. It sounds reasonable (since the '030 is a 32-bit processor), unless Jack had another son/daughter whose name starts with T
I didn't get any solid hits in google results for "ST stands for Sam Tramiel", instead I got these two at the top and some more. But I didn't follow all the links, of course.
Ooh, who will bring clarity to this issue??? :P
I wanna find out, coz I'm an occasional visitor to old-computers.com and if they're wrong I'd ask them to correct any mistakes. I want the history of computing to be accurate!