Because filius Bonacci was his last name.
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because that is his nick name
Leonardo Fibonacci first recorded his sequence in his book Liber Abaci, which was published in 1202.
We know that his father was Guglielmo Bonaccio. Leonardo of Pisa, who is generally called Fibonacci today, is not known to have had a family.
Leonardo of Pisa.
Leonardo Fibonacci, who was also known as Leonardo of Pisa, an Italian mathematician of the 13th Century.