who is the eponymous hero in the books written by kevin crossley-holland
This site will tell you about the book trilogy and give you the name of the hero.
http://en.wikipedia.org/wiki/The_Seeing_Stone
To find out the eponymous hero in the books written by Kevin Crossley-Holland, you can visit the provided link to the Wikipedia page about "The Seeing Stone," which is the first book in the Arthur Trilogy written by Kevin Crossley-Holland.
On the Wikipedia page, scroll through the information about the book and its plot to find the protagonist's name. In this case, the eponymous hero in the book series is Arthur de Caldicot.
By following this process, you can not only find the answer to your specific question but also learn more about the book series, its author, and other relevant information.