Zoro wtf
"Surprisingly, Zoro is also based on a real-life pirate named François l’ Ollonais. Zoro's surname is based on the Japanese pronunciation of the pirate captain. François l’ Ollonais was a famous pirate and he was active during the 1660s."
Big Mom
"She boasts of a bounty over 4 billion beris. Linlin is also capable of using all three types of Haki. Her name has been taken from two real-life pirates. The first is Charlotte de Berry, a pirate from England and the second is Charlotte Badger"
Jewelry Bonney
"Anne Bonney was a very famous female pirate who was active during the 18th Century. She was born a noblewoman, but clearly, the comfortable life wasn't for her, so she decided to be a pirate."
Lafitte
"Lafitte has been based on Jean Lafitte, who used to be a protector of law at one point in his life. However, he couldn't contain his hunger for action and money, so he decided to become a pirate. Jean Lafitte was active during the 1800s."
Kid
"Kid was able to injure a Sweet Commander of the Big Mom Pirates. The fight was off-screen, so there aren't any details about it. Eustass Kid's surname has been taken from Eustace the Monk, who was a French pirate that was known as a mercenary. The name Kid was inspired by a Scottish pirate known as William Kidd, who was executed for his piracy"
X - Drake. Funny thing is I read about Sir Francis Drake back in school and didn't even connect the dots.
"He is very likely based on Sir Francis Drake, who was an English pirate and a well-known explorer of the Elizabethan era."