Answer
The other surname of Abd al-Rahman I was Saqr Quraysh, which translates to "Falcon of Quraysh". He was known by this title because of his fierce military campaigns and successful leadership in expanding the Umayyad caliphate in Hispania. He was a skilled strategist and tactician, often employing falconry techniques in his military maneuvers, hence earning him the name "Falcon of Quraysh".