Literature Reference: 梓，木也，瑜，美玉也。—— 《说文解字》 Zi refers to a type of wood, while Yu means beautiful jade. Source from 'Shuowen Jiezi'.
梓: The tree name, known as the Catalpa.
瑜:
The radiance of jade, auspiciousness and well-being, grace and composure.
Meaning: The name signifies being as solid as catalpa wood and as precious as fine jade.