Jund al-Urdunn
According to Baladhuri, al-Jarrah was born in Jund al-Urdunn (military district of Jordan) and probably followed Sufyan ibn al-Abrad al-Kalbi and Abd al-Rahman ibn Habib al-Hakami to Iraq in 696. The latter and al-Jarrah hailed from the Banu al-Hakam ibn Sa'd al-Ashira tribe, a branch of the Madh'hij. In 701, he fought against the rebellion of Ibn al-Ash'ath.