Whoever "Devlin Stone" is, he's likely based on some obscure cultural reference ...
Nope.
Two of the names are plays on guys in my gaming group. The other two were random generators. One of four is the for-sure thing.
I know this for absolute certainty because Herb and I had a long discussion about Stone with Randall, and constructed a background and story for him, in case the opportunity to write his saga ever came up (either via a novel, novella, or e-pub for Battlecorps). That opportunity never happened. (It may yet still.)
What is for absolute certainty, and something we've known since Day 1, is that Stone is indeed an 'every man' who rose up into greatness from obscurity with no noble blood, backing, or hidden agenda.
I will admit the decade-plus of conjectures, theories, and 'investigations' by fans/players has entertained me to some extent over the years...