Which camera brands famous in the world?

Nikon, canon, sony, panasonic, fujifilm.kodak

All of those.

All of those. Kodak is rather infamous though.

Also add Leica and Samsung.

Nikon
Cannon
Leica
Hasselblad
Mamiya
Pentax
Olympus
Minolta
Sony
etc…

You more or less have made a complete list. Not all popular brands are great though. Hasselblad, the industry standard is relatively unknown to most picture takers.

I think cannon is the best camera company in the world but sony will do. Now a days they are serving well.

NIKON I <3 NIKON THEY ARE THE BEST. THEIR CAMERAS TAKE THE BET PHOTOS, ARE BUILT THE BEST, HAVE THE BEST FEATURES, AND BAVE THE BEST LENSES

All of those, also Pentax, Leica, Hasselblad, Sinar, Olympus, Minolta (now taken over by Sony), Contax.

Famous for what, and famous amongst which group of people? Canon still sell more cameras than other makers, so I guess it is very well known; Nikon is it great rival (like Pepsi to Coke) and both make fine cameras.
Horseman is famous amongst architectural and landscape photographers, but who else has heard of them?

Actually all of them! I just prefer Nikon and Canon.

Bronica
Yashica
Zenit (my first SLR)
Voigtlander

Leica - Virtually invented 35mm photography.(Kodak made their 35mm cassette compatible with Leica, so other manufacturers had to use it.)
Zeiss - Finest quality cameras and lenses, invented M42 screw and the first pentaprism.
Rollei - Best known for their gorgeous TLRs
Exacta - The world's first 35mm SLR.
Hasselblad - Modular medium format SLRs high quality and matching prices.
Pentax - First Japanese SLR, first reliable instant-return mirror.
Minolta - First multimode SLR (XD-7), first successful autofocus SLR (7000AF).
Canon - Started out with Leica copies, now one of the big boys in the pro market.
Nikon - Copied the Zeiss Contax and tweaked it, the other big boy in the pro market (the Nikon F is a legend).
Kodak - Lousy cameras made cheap - made their money by having the film/processing side sewn up ( just about any film uses Kodak chemistry and most labs use their paper).