What kind of camera brands are there?

At the moment, I'm taking Digital Photography for school and I'm currently using a Nikon. (I love my D3100!) I know that there's Cannon, FujiFilm, and Sony, but out of curiosity, what other camera brands are there? Are there brands that are not specifically sold in the US? It peaks my interest.

Oh and btw, I'm not talking about the Point and Shoot ones. Definitely just DSLR cameras.

Oh and if you do have a DSLR, What Brand and model do you have?

There's Canon, Pentax, Nikon, Konica-Minolta, Sony, Sigma, Mamiya. Hasselblad, Fujifilm, Leica, Panasonic, Contax, Olympus…

There's more. It would be easier if you tried to Google keywords like dslr brand, rather than having us regurgitate them here.

I have used Cannon EOS 40D & it's a good entry level DSLR. There are a lot of DSLR available specially in Japan. Some of these I know are

Epson
Panasonic
Olympus
Pentax
Kodak

There are popular brands and there are obscure brands. There are specialty brands and there are general purpose brands. There are established brands and there are mediocre brands. Now I'm pretty sure this is not what you are asking about but then I can't help myself.

DSLR brands? Here, help yourself.

Medium format dSLR brands include the following.

Hasselblad
Mamiya
Leica
Pentax

Full-frame, 1.5X and 1.6X crop sensor dSLRs are made by the following brands.

Canon
Nikon
Pentax
Sony
Sigma

Four-thirds dSLRs are made by:

Olympus
Panasonic
Leica

These two both have stopped making dSLRs years ago.

Kodak
Fujifilm

Then there's Konica-Minolta that got bought by

Sony

to start their dSLR line and

Samsung

who ventured briefly with Pentax to start their digital camera line.