Well, a good way to start is by considering words related to comics, creativity, or fantasy. Maybe combine them to form a unique name. Like 'Inkspiration Comics' or 'Creative Comics World'. Another option is to base the name on your personal interests or the message you want to convey through your company.
When a novel was adapted into a comic, the rights to the comic would usually belong to the comic company, not the author. This is because comics are usually created by independent comic companies or cartoonists and then adapted into various forms of media such as animation, comics, movies, etc. In this case, the comic company had the right to use, adapt, or re-create the comic under any circumstances. The author of the novel only created the content of the novel and did not have the right to manage the copyright.
Of course, in some cases, the author of the novel may cooperate with the comic company to adapt the novel into a comic. In this case, the ownership of the comic may belong to the author and the comic company. However, in this case, the author would usually receive a certain share of the copyright revenue to compensate for his contribution.
First, you need a clear business plan. Know your target audience and the type of comics you want to produce. Also, secure enough funds for initial operations.
Well, you could try legal means like filing complaints or lawsuits if they're operating illegally. But that's a big step and should be based on solid evidence.