Diesel
No. The Facebook logo says "Facebook" and the Reebok one "Reebok" ;-)
Guines
Guinness
Hjl
Nokia
Simple, eye catching and informative.
maybe euroshopper or eurostar
tillamook
The most obvious successful company that springs to mind with a letter C as a logo is Chanel perfume with its intertwined letter C back to back. To a lesser extent, Toyota used to have a C logo to advertise the Corolla car in the 1970's.
Sheer coincidence.
Airblaster.
Guinness