What's the pronunciation of Masu?

Ma Su (190-228), a native of Yicheng, Xiangyang (now the south of Yicheng, Hubei), was the minister of Shu and Han in the Three Kingdoms period and his brother. Jingzhou took Shu to Sichuan with Liu Bei at the beginning, and served as Mianzhu, Chengdu Order and Taishou. Zhuge Liang, the prime minister of the Shu and Han dynasties, also joined the army. Ma Su is "brilliant" and good at military planning. Zhuge Liang has always attached great importance to him. Every time he is introduced to talk, he stays up all night. However, during the Northern Expedition, Ma Su lost his street pavilion due to operational mistakes and was beheaded by Zhuge Liang.