I'd imagine that just like any other hair color it's not unique to one bloodline, people focus on the hair color when the actual standout feature was that they were literally giants, skeletal remains of these giants have been found, it's not just a myth, there were literally giants in ancient times, but people focus on the hair color like that's the interesting part
They're not talked about in history class because the red headed giants scattered about the world were the nephilim
I'd imagine that just like any other hair color it's not unique to one bloodline, people focus on the hair color when the actual standout feature was that they were literally giants, skeletal remains of these giants have been found, it's not just a myth, there were literally giants in ancient times, but people focus on the hair color like that's the interesting part