Literature Reference: 还知楚河内，天子许经年。——《送夔州班使君》 卢纶 Still knowing within the Chu River, the Emperor permits years to pass. From 'Seeing Off Prefect Ban to Kuizhou' by Lu Lun.
天: The sky, encompassing all things between heaven and earth, when used in a name, often symbolizes grand ambitions and aspirations, as well as a lifetime of unwavering integrity. This character represents the auspiciousness of pure yang and solitary excellence, capable of bestowing the profound utility of great endeavors and significant achievements.
许: "Consent and approval. A character that signifies the ease of achieving great endeavors and is auspicious for future matrimony."
Meaning: Tian Xu signifies heavenly favor and permission, implying blessings and approval from above.