Nguyen Xuan in Chinese / Japanese...

禤 is the most common character for a Chinese surname that romanizes as Xuan.

禤 is also a name in Korean that romanizes as Hwon or Hweon.

阮 is the original Chinese character that represented the Vietnamese surname Nguyễn before Vietnam stopped using Chinese characters and romanized their language. It is probably the most common surname in all of Vietnam. While romanized as Nguyen, it sounds more like the English word “Win” or “When.” 阮 can also represent the Nguyen Dynasty in Vietnam, which lasted from 1802 to 1945.

阮 is also the Chinese surname Ruan, most Chinese with this surname have ancestors from a small state named Ruan during the Shang Dynasty (1600-1046 BC) located in the southeast of modern-day Gansu Province.

In Japanese, this can be the rare surnames pronounced Min, Gen, Ken, Gan, or En.

Besides a surname, this character also represents an ancient musical instrument.

玄武 can refer to the Black Tortoise (an ancient Chinese constellation of stars- part of the seven mansions of the north sky).

In Daoism, this is the God of the North sky.

This also refers to a Black Tortoise god, said to rule over the northern heavens in Japanese. Can also be pronounced/romanized as genmu or when used as a personal name, Hirotake in Japanese.