Leonardo Fibonacci was born around 1170, in Pisa, Italy. He was the son of Guilichmus Bonacci, the secretary of the Republic of Pisa. The name of his mother is unknown. He is also known to have had a brother named Bonaccinghus, but nothing of him is known to be recorded, save for his name.
Contrary to what many believe, his name originally wasn't Fibonacci at all, but Leonardo Pisano. Fibonacci translates to "son of Bonacci," which would explain the reason for his nickname. This nickname wasn't used until 1838, when Guillaume Libri, a great historian first used the name.