Literature Reference: 思者，心之所虑也；一者，纯一不杂也。—— 《说文解字》 Si refers to the thoughts of the heart; Yi signifies purity without impurity. Source from 'Shuowen Jiezi'.
思: Thought, intellect. In names, it often signifies quick thinking, sharp wit, and intelligence.
一: To signify the beginning, to embody the entirety, and to represent the pinnacle of excellence and perfection.
Meaning: Si Yi implies pure thoughts and unwavering focus, striving for simplicity and concentration.