What most people do is they trademark the name, that way even though someone might fork, they have to use a different name. Something else you can do is use (A

What most people do is they trademark the name, that way even though someone might fork, they have to use a different name. Something else you can do is use (A)GPL3. This means you automatically grant patent licenses, and anyone building on your work also has to release their source. You can then separately sell proprietary licenses without any of these restrictions.