He used his epeen to himself over the head and simply forgot the name of his sword.
Kenpachi zaraki sword name. Its explained by Ōetsu Nimaiya. But that jagged scratched and dented nodachi that Zaraki stole didnt have a name at least not that he was aware of. The Tsuka and Saya are white and the blade is notched due to the spiritual disharmony between it.
Nozarashi 野晒 is the manifested spirit of Kenpachi Zaraki s Zanpakutō. A Zanpakutos name unlocks Shikai the power that lies within that blade and the abilities that suit the user. To him that blade was merely a tool.
But the Shinigami with ranks have names. His title of Captain an excuse to fight stronger and stronger opponents. Kenpachi 剣八 Sword-Eight is the title that is only given to the strongest Shinigami.
Definitely not Bankai though. Finally he will be unleashing its shikai form. It can cut or stab anything with only a few good hard sta This is the katana of the powerful captain Kenpachi Zaraki killing hundreds of adult fighters and wound Retsu Unohana the 1st Kenpachi in battle.
Remember that Zanpakutos real name is Asauchi. Isnt his back story something about that he himself doesnt even know his true name. Basic Soul Tree Attack Similarity.
Anyways his swords name is clearly bankai he obviously was the one who discovered bankai and sealed away his knowledge via amnesia. Kenpachi clearly stated My zanpakuto doesnt have a nameIts not even sealed in the first placeMy zanpakutos true form is this blade Since Ichigo originally had a zanpakuto that was unlike a regular unreleased zanpakuto couldnt it be possible that Kenpachi is in a similar state. Yachiru was Zarakis true spirit.