You don't. Names, titles, and common words/phrases are not eligible for copyright protection. In some cases, however, names can be registered as trademarks.
When it comes to a name, you are better off seeking a Trademark for it.Regarding copyright, different countries have different avenues for copyrighting any form of media. See the related links for...
Examine the word itself; "PHOTOGRAPHY"
It come from two individual words. Photo meaning "Light" and Graph meaning "To Write"
Literally it means: "To Write with light" I cannot think of any better...