Funny how so much film is the same ol' stuff.
Well, if you think about it, there are a limited number of coating facilities capable of making quality film -- more for black and white, and fewer for color.
For color, the list is VERY short: Kodak, Fuji (on hiatus, it seems, other than for Instax), and (possibly no longer due to events) Innoviscoat or whoever wound up with their assets. Agfa and Ferrania dropped out of C-41 and/or E-6 production years ago, and Konica may or may not ever have been separate production from Fuji. Polaroid 35 mm film was always rebranded with the exception of the "instant" slide films (for which the chemical packs and processors are like hen's teeth even if you can find some of the film).
For B&W, the list is longer, because the process is more tolerant of variations: Kodak, Fuji, Ilford/Kentmere, Foma, Ferrania (in low volume, effectively test roll quantity), likely Shanghai, possibly one other facility in China that doesn't sell outside its homeland, probably not Svema or Tasma any longer (Svema branded film sold new at this date is either old stock or rebranded).
Any film you get that isn't one of those brands is either rebranded new production (as mentioned above, Freestyle's .EDU Ultra rebranded from Foma), old frozen stock freshly confectioned from the master roll (looking at you, Rollei film), or just plain expired (with or without honest expiration dates on the end user packaging).