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According to a few Google searches it was a physisict Hugh Everett in the late 50s. I am sure there were others in more meta and philosophical concepts in the past but I get the idea he is the known physicist to come up with it.
Disclaimer I didn’t read a lot but his name came up a few times and I assume he had a theory that could relate to physics at the time.
I still like that Flash was probably the first for pop culture, when weird time travel started happening in other shows (after deep into Flash recent series) I started joking it was just Barry messing up crap between the multiverse and time.
As a kid I rarely listened to anything, these days I put on Hitchhiker’s Guide to the Galaxy radio show, just go bacl to the start I’ve heard up to the third phase often but not the further ones as much. In the more recent past it may have been a Harry Potter (UK) book or again Hitchhiker’s Guide to the Galaxy voiced by Stephen Fry. Guess that’s a lot of UK stuff considering I’m Canadian, but Fry has such a nice voice to drift off to.