In this day and age it’s more important to check your web options which is easy enough to do. I wouldn’t waste time or money registering names unless you’re seeking to limit liability via a company then that will be automatic as you can’t register a name that already exists.
Once you are going there isn’t that much protection anyway, your name tortus for instance could be spelt tortoise or tort-us or tor-tus if anyone seriously wanted to get involved in copying what you are up to, which is extremely unlikely.
Your protection will be your products and the innovative nature thereof and the name and logo style which can just fall into standard copyright protection.
Name protection can be done, I’m just saying for a small business at the outset, it’s a needless time wasting expense. Build whatever you’re going to build and hopefully they will come, providing it works they’ll ride it whatever it’s called, even something as ghastly sounding as On-One or Knolly.