What are the names of the shopkeepers? Do they even have ones?

Yep!
The Info Desk has a whole guide dedicated to them:

The Menewsha NPC Guide

Ooh I was thinking along similar lines! Whenever I see certain NPC names cited, I can hover over them and I get a bolder version of their name but no info and it's kind of confusing. @[email protected] I've been curious, I'll head over to the link and read up!

While I'm at it, are there any old news posts I could access or any other pages with info about the Mene world?

There's the manga.

Thank you very much! I will engross myself in it for a while. ^^

:) Have fun, it's really good. Goes to last Halloween I think.