Please name an ancient celebrity surnamed Xu.

Xu Xiake: Ming Dynasty geographer, explorer, traveler and writer.

Xu Yanshou: a famous poet and scholar in the late Ming and early Qing Dynasties. Ming Zhu Sheng, who was not an official, and Xu You and Chen Jun were called "three gifted scholars in Fujian", which made him famous for a while.

Xu Wei: an outstanding writer, painter and calligrapher.