User blog comment:Xilinoc/Ch. 611 - The Soul King Dies (edgy as ever, Kubo)/@comment-6073876-20141226213028/@comment-5693502-20141226222429

Oshō knows the name of every zanpakutō from the moment they are given out to a Shinigami. This means they already had names to begin with; Oshō just knows what the name(s) is.

He is only able to give and take names via his zanpakutō.

I refuse to believe that Oshō named and names everything. He was the first person to name upper limbs, "arms" ? No.