what hair is this? any idea?

zireal59

I have searched a lot can u help me?

Gordig

Definitely looks like SdeB's work, most closely resembling Braided Bun, possibly with some parts hidden.

Ninefold

That render also uses one of the baby hairs from this product.

Edit: oh, and on reflection I think it's actually Braided Pony Tail G8F with the ponytail turned off. Notice how that hair parts on the left, and has what amounts to a small bun at the base of the ponytail.