We already know which languages were created by PPCG users. Clearly language authors are inspired by each other and by existing practical languages. What are these relationships?
Looking for something like this.
As of 2018-09-05 @ 1:59 (UTC):
Historically, the oldest languages are:
Then around 2015 an explosion started and nowadays there are a few dozen of golfing languages. It's thus reasonable to assume that languages that followed
2013-now at least have some relationship to one of those three - most likely to GolfScript because the other two aren't really as widely known and GolfScript is featured in the Wikipedia article about codegolf.
They inspired other people to design their own golfing languages and might have drawn a few people into esoteric programming languages to begin with. GolfScript2 was clearly inspired by GolfScript and GolfScript2 was the first "officially" esoteric one afaik that actually said "screw ASCII" and this inspired other people to try to map as many instructions into a 8bit encoding.