John Francis Anthony Pastorius III , known as Jaco Pastorius d k o p s t r i s , was an influential American jazz musician, composer, big band leader and electric bass player. He is best known for his work with Weather Report from 1976 to 1981, as well as work with artists including Joni Mitchell, Pat Metheny, and his own solo projects.
Pastorius was born December 1, 1951, in Norristown, Pennsylvania, to Jack Pastorius and Stephanie Katherine Haapala Pastorius, the first of their three children. Jacos grandmother was a Finn, named Kaisa Eriika Isojrvi. Jaco Pastorius was of Finnish, Sami, German, Swedish and Irish ancestry. He was a descendant of Francis Daniel Pastorius.
Source: Wikipedia