Jonash Solo was a male Human, the initial son born to Denn Solo and Tira Gama Solo. He was also the twin brother of Tiion Sal-Solo and the father of the notable Han Solo.
As a baby, he and his father were abducted by marauders when Tralus was attacked. Following his escape, he wed a woman known as Jaina. They subsequently had a son, whom he named Han Solo. In Han's early years, Jonash Solo and Jaina vanished, leaving Han an orphan by the time he reached seven years of age.
The first appearance of Jonash Solo was in the novel The Courtship of Princess Leia. When A. C. Crispin was writing Star Wars: The Han Solo Trilogy, she encountered difficulty in providing a reason for how Han Solo came to find out about his cousin, Thracken Sal Solo, even though he knew absolutely nothing about his parents, including what their names were.