Resident Evil isn’t the “original” name, since the Japanese version calls the entire series BIOHAZARD. Only versions outside Japan call and refer the entire series as Resident Evil. They’re exactly the same game with the difference being the name. I think BIOHAZARD refers to the end game sequence (in most entries in the series, but not all) where they find the lab that’s owned by Umbrella Corp.


On their Wikipedia, first paragraph of History:
I’ve been a long time fan of the series and never took the time to learn this. I also never knew it was ported to the Saturn, so doubly neat. We’re having a two-for-one special on the fun facts today.
For a long time I held the belief that it was renamed for american audiences to play up the haunted house aspect (The RESIDENT of this abode of the damned is EVIL). Which made it all more amusing when the franchise immediately pivoted away from exploring mansions by the time the second game came out.