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.

壹: The Chinese character for the numeral "one" in its formal, capitalized form. Commonly used in documents such as receipts, invoices, and financial accounts. In personal names, it holds no specific significance.