What is Minato's kunai name?

Hiraishin Kunai (飛 雷神 ク ナ イ)

Minato's kunai is named Hiraishin Kunai, which is a special kunai (特 注 ク ナ イ, tokuchū kunai) which is a weapon that is characteristic of Minato Namikaze, who uses it with his Space-Time Ninjutsu or known as the Flying Thunder God Technique.

Kunai with 3 blades

The Hiraishin Kunai is different from the normal kunai, the Hiraishin Kunai has three blades instead of one and on the handle (which is thicker than normal) is a "marker" for Minato's teleportation ability; Minato also said that this kunai is a little heavier than normal kunai. Kunai eyes resembling the forks found in this kunai also make it more deadly kunai in close combat.

Kakashi's Hiraishin Kunai

Minato once gave one of these kunai to one of his students, Kakashi Hatake, as a celebratory gift for promotion to the jōnin and as a means of teleporting to his team any time as long as they have this Hiraishin Kunai.
Teleport Kunai During the Third Shinobi World War, in the battle between Konohagakure and Iwagakure, one of the Konoha ninjas threw this kunai behind enemy lines allowing Minato to instantly teleport to various locations and kill enemy shinobi at the same time making it difficult for the enemy to predict where he was. will teleport forward. Minato also kept some of these knives in his safe house, so that Minato could teleport there quickly if needed.

Teleport Kunai

During the Third Shinobi World War, in the battle between Konohagakure and Iwagakure, one of the Konoha ninjas threw this kunai behind enemy lines allowing Minato to instantly teleport to various locations and kill enemy shinobi at the same time making it difficult for the enemy to predict where he was. will teleport forward. Minato also kept some of these knives in his safe house, so that Minato could teleport there quickly if needed.