哪位高人知道程朱理学之"理学"英语叫法是什么?

何必那么麻烦？

理学就是“Neo-Confucianism”。
Neo-Confucianism of Cheng-Zhu
Cheng Zhu Neo-Confucianism

理学
lǐxué
[Confucian school of idealist philosophy of the Song and Ming dynasties] 宋明时期的一种崇尚理性的唯心主义哲学思想。包括以周敦颐、程颢、程颐、朱熹为代表的客观唯心主义和以陆九渊、王守仁为代表的主观唯心主义。前者认为“理”是永恒的,先于世界而存在的精神实体,世界万物只能由“理”派生。后者提出“心外无物,心外无理”,认为主观意识是派生世界万物的本原。也叫“道学”

道学
dàoxué
(1) [a Confucian school of philosophy of the Song dynasty]∶宋代儒家周敦颐、张载、程颢、程颐、朱熹等的哲学思想

也叫: "Neo-Confucianism"

Neo-Confucianism (理学 Pinyin: Lǐxué) is a term for a form of Confucianism that was primarily developed during the Song dynasty, but which can be traced back to Han Yu and Li Ao in the Tang dynasty. The term should not be mistaken for New Confucianism which is an effort to apply Confucianism to the 21st century.

Neo-Confucianism was a response by the Confucians to the dominance of the Taoists and Buddhists. Neo-Confucians such as Zhu Xi recognized that the Co