With a good lawyer and a bundle of money you might be able to get him to back down for infringing on your trade name. (Possible but not likely.)

In my city we have a garge door company that has been around for many years - Overhead Door. Now we have:

American Overhead Door
Pikes Peak Overhead Door
Colorado Rockies Overhead Door

If Overhead Door has been unable to stop newcomers from playing off their name I doubt you can stop your interloper (unless you have deeper pockets than Overhead Door).

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"Baseball is like church. Many attend but few understand." Leo Durocher
Bruce Breedlove
www.avaloninspection.com