Unhinged name theory
Almost all of the characters have "in" somewhere in either their first or last names.
Devon = Dev"in".
Ricken = Rick"in".
Eleanor = El"in"or.
Dylan = Dyl"in".
Irving = Irv"in"g.
Helena = Hel"in"a.
Harmony = Harm"innie".
Burt Goodman = Goodm"in".
Natalie Kalen = Kal"in".
Mr. Drummond = Drumm"in"d.
Eagan = Eag"in".
Lumon = Lum"in".
Then there's Mark Sc"out".
Seth Milchik, Gemma/Miss Casey, Petey, and Miss Huang are exceptions that possibly completely blow this theory out of the water. And yes, a ton of names have an "in" sound so it could just be a coincidence.