My first store-bought camera was a Kodak Ektralite 10 (it replaced a home-made pinhole).
I bought my first SLR in 1982 with money I saved from my part-time job... a K1000 with 50mm, 70-210 (Toyo Optics?) and a tiny Sunpak flash (and a bag) for $229 IIRC.
I still have the K1000, but I did upgrade to a SuperProgram to get auto exposure and then in college to a PZ-20.
First digital was a Kodak DC20 in 1996 (shot the olympics with it until I landed on it and smashed it... the PZ-20 survived since I broke its fall...)
Digital came in 2003 in a more useful sense with the Nikon Coolpix 4500. Man, that thing was awesome...
I got a K10 in 2007 as a graduation present to myself for finishing the dissertation... then a K-01 when the kid was born...
I pre-ordered the K1 when it came out, and I paid for the upgrade to the MKii in 2018, and I won a KP here, which I use probably more than any of the others... that thing is superb...
The PZ-20, Nikon 4500, and K-01 have all been passed on to family members, but I realized about 15 years ago that all the cameras I wanted in my youth were dirt cheap, so I have a mildly ridiculous collection of cheap film stuff that I try to keep working happily. Most of that is between WWII and 1970, but there are a couple before and after.
Weirdly, I only have one Olympus (the XA), one Canon (a Bell-and-Howell Dial 35), and one Minolta (Himatic 7s), but three Graflexes.
The lack of Canons surprises me the most, but I've never got on with their ergonomics. I like a couple of the Minoltas, but I don't need another lens lineup to care for
I do have a couple of Nikons (F, N65, Nikkormat FTn) and some lenses. The Nikons seem to have the best ergonomics outside of Pentax, so I seem to like those better... the F is great fun... and I'll get another FG next time I see one cheap enough...
I have a couple of Kodak Retinas and Retina-adjacent cameras, which I really enjoy, and I just (foolishly?) got my third Argus C3 to get the wide angle lens...
So outside of Pentax, maybe Nikon and Kodak?
-Eric