Literature Reference: 鸿雁于飞，肃肃其羽。—— 《诗经·小雅·鸿雁》 The wild geese fly, their wings rustling solemnly. Source from 'The Book of Songs, Xiaoya, Hongyan'.
于: Thus, it is.
雁:
The wild goose, flying in formation, often symbolizes in a name a person with grand aspirations, ideals, and a clear sense of purpose.
Meaning: The wild goose symbolizes freedom and lofty aspirations.