The classic Crescent Wrench is also known as the C-Wrench. The generic name for this tool is “Adjustable” Wrench. Crescent just happens to be the leader in quality and popularity. Same as the term “Leko” is so often used to describe a standard Ellipsodial Reflector Spotlight. Leko is a brand name used by Strand Lighting for their spotlights. An ETC SourceFour is not a “Leko.”
You get the picture.

I love the Crescent line of wrenches. They’re a little more expensive than many other brands, but well worth it if you’re the type of person who doesn’t tend to lose their tools. 🙂