The Witcher is one of Netflix's most watch shows. I'd also imagine that most people in English speaking countries have been exposed to Shakespeare's nickname in high school English classes.
It’s generally a common trope in fantasy and Romanticist literature. It’s also a word that exists in virtually all European languages in a similar form (bard, bardo, barde, бард), although similar but different forms may be a negative.
I don't think it's that out there. You'd have to be quite uninformed to have never heard of it. It's no verderer or reeve (medieval positions that most people actually will not have heard of).
The Witcher is one of Netflix's most watch shows. I'd also imagine that most people in English speaking countries have been exposed to Shakespeare's nickname in high school English classes.