Jalan Dato Onn Jaafar was formerly named Cockman Street, after Herbert James Cockman, who was a major in the Federated Malay States Volunteer Force during the Second World War. His name replaced that of Japanese Admiral Tōgō Heihachirō, regarded one of Japan's greatest naval heroes of the early 20th century, before the Second World War. However, the Japanese atrocities during the Second World War and the ensuing animosity towards Japan led to the renaming of the road to honour Cockman. The road underwent another name change, to honour Dato' Ann Ja'afar, the founder of the Malay political party UMNO.