"sa Byrcus", or in English, "leader/king of Byrcus", refers to my status as the leader of the hypothetical "Byrcus Nation" that my viewers are citizens of. The title "sa" goes back generations, and can trace its roots all the way back to the Persian word "shah". "Byrcus" on the other hand, also originates from a title, specifically a Hiberno-Roman one passed down from my ancestors to me over the past two thousand years.

I'm just kidding I made all of that up I got the name sabyrcus from this Transylvanian dude I met a few years ago