No one is born with naturally blue hair. Human hair pigmentation doesn't include blue.
However, the reference clarifies a nuance:
The Illusion of Blue Hair
While true blue hair isn't a natural human trait, some people are born with hair so dark it appears blue. This effect is primarily seen in individuals of East Asian descent. Their extremely dark black hair possesses a metallic blue sheen due to its intense pigmentation. This visual effect creates the illusion of blue hair, but the actual hair color is a very deep black.
- Clarification: The perception of "blue hair" in this context is entirely due to the intense darkness and reflective qualities of the hair, not an actual blue pigment.
