Literature Reference: 思者，心之所虑也；延者，长也。—— 《说文解字》 Si means the thoughts of the heart; Yan means to extend or prolong. Source from 'Shuowen Jiezi'.
思: Thought, intellect. In names, it often signifies quick thinking, sharp wit, and intelligence.
延: "To extend, to introduce, and to facilitate the attainment of grand achievements, this character is auspicious for garnering fame, fortune, and good luck."
Meaning: Si Yan signifies profound contemplation and the extension of wisdom and vision.