@AD-HD:
Sakazuki. His real name is Sakazuki.
Just FYI, Sakazuki is a type of kite. Coincidentally, Kaku is a type of kite, too, but Kaku also means square.
The names of the three admirals comes from an old Japanese fairy tale called Momotaro.
Here's the story of Momotaro:
One day, an elderly woman was walking along the river when she found a very large peach. She took it home and took a bite, and it made her young and fertile again. Her elderly husband came home and took a bite too, and became young and vigorous. That night, they made love, and months later, a baby was born. They named the boy Momotaro (Momo means peach, taro is a common Japanese name. So literally, "The Boy born from a peach").
On Momotaro's 17th birthday, he decided to set out and slay the Oni (demons/ogres) of Onigashima island, which were plauging his town. To help him, his parents gave him 4 meat dumplings.
Momotaro met a Yellow Monkey, a Red Dog, and a Blue Pheasant along the way, and in return for a meat dumpling, they agreed to help him on his quest.
When they reached Onigashima, they found a huge locked gate guarding the entrance. The Blue pheasant flew up over the gate and unlocked it from the inside. They charged in and slew the ogres, until they came across Ura, the Oni leader. Fighting valiantly, Momotaro slew Ura with the power of his meat dumpling and his sword. When he returned home, he was a hero.