Literature Reference: 梓，木也，桦，木也。——《说文解字》 Zi, a type of wood; Hua, another type of wood. Source from 'Shuowen Jiezi'.
梓: The tree name, known as the Catalpa.
桦: The tree species, birch. "Birch" symbolizes the toughness akin to a tree, unyielding to wind and rain, metaphorically representing a robust physique conducive to good health.
Meaning: Zi Hua signifies resilience and symbolizes stability and growth like trees.