Aside from Lee, Telltale has been keeping us on a strict first-name basis with just about everyone. But considering how long Kenny's been around (he's arguably the third most important character in the series, the second being Lee, and the first Clem), maybe it's time we found out his full credentials? Or is it unnecessary at this point?
Personally speaking, I'd love Kenny's last name to be "Varney" as a nod and a wink to the late Jim Varney, but that's just because Ernest movies are my favourite guilty pleasures. :p