My first film was in an old 620 Brownie that my parents used to photograph me when I was a baby. I don't remember the model, and it is long gone (wait...my sister may have it stashed in a closet, in her house in Barrie, Ontario; I must ask). I don't recall the brand of film for sure, but I think it may have been Kodak Verichrome Pan film, and it would have been about 1962.
When I received my first real camera, at Christmas 1968, a Practika Nova (also long gone), my first film was Kodacolor-X, 20-exposures. My first B&W film was Tri-X pan, also 20-exposures.