Or not involving a Witcher as a main character at all.
Because otherwise it's "The Other Witcher That's Not Geralt"
I could be wrong, but I'm pretty sure other games have similar "The X" names but don't necessarily always follow the same character. At this point, "The Witcher" might as well just be a brand name. Thronebreaker has a "Witcher Tales" subtitle, but as far as I know, Maeve (? not sure of the spelling) is not a Witcher in any way.
On the topic of the Witcher show, I thought it was excellent. The fact that it has something like a 53% critic score and a 92% audience score is, in my opinion, quite telling. Please note I'm not here to moan about "journalism" and all that nonsense, but in my experience, many of my favorite films or shows are hated by critics for one reason or another. There's a few exceptions (Blade Runner 2049), but usually, that's how it goes.
I think it helps a lot that I've read the Witcher books and played the games, but my family members and one of my best friends have done neither and they also loved it. People all seem to agree that the first two episodes are extremely confusing, though.
I think Cavill plays Geralt very well. I hope he shows a bit more emotion and the subtle sarcasm Geralt is known for (yes, I'm aware it's more toned down in the books versus the games) down the line. I like that he took queues from the game Geralt for the voice. I like Yennefer and Triss. I LOVE Ciri. LOVE Jaskier/Dandelion (takes some getting used to, that name, but I like it). I despise Fringilla's character, I liked her much better in the games (didn't like her in the books either, for the record).
I hope this show gets many seasons. Of course, not going on longer than is appropriate. I also wish people would stop comparing it to Game of Thrones. This is a false and misleading comparison, and if you try to get people to watch the show based on that, don't be surprised if they end up hating it.
I think what the show did very will is help set up the characters, their motivations, and personalities. By the end of Episode 8, we should all have a decent idea what kind of people we're dealing with. Who has a good heart, who is willing to cross lines for the greater good, who is downright evil, and who is flawed but sympathetic, etc... This is what a first season should accomplish.