Why is Fibonacci his nickname?

Fibonacci, whose full name is Leonardo of Pisa, earned his nickname from the Italian phrase "filius Bonacci," meaning "son of Bonaccio." He is best known for introducing the Fibonacci sequence to the Western world in his 1202 book "Liber Abaci." This sequence, where each number is the sum of the two preceding ones, has significant applications in mathematics, nature, and art, contributing to his lasting legacy.