The most difficult surnames to write are: Cuan, Kuai, Zuo, Xuan, and Qu.

1. Cuan

The population with the surname Cuan is mainly distributed in Lijiang, Dali, and Baoshan in Yunnan Province, Yibin in Sichuan Province, Shishou, Jingmen, and Zaoyang in Hubei Province, and in Henan Province Nanyang, Luoyang, Yuncheng in Shanxi Province, Baoji, Xi'an, Huayin and other places in Shaanxi Province. However, because this character is too difficult to write, some people with the surname Cuan changed their surnames to Cun, Quan, Chui, Chuan and other surnames.

2. Kuai

The surname Kuai is mainly distributed in Xiangyang City, Hubei Province, and is also found in Henan, Shandong, Anhui, Jiangsu, Shanxi and other provinces. There are many historical celebrities with the surname Kuai. The more famous ones include Kuai Tong, the great strategist between the Qin and Han dynasties, Kuai Yue, the great strategist during the Three Kingdoms period at the end of the Han Dynasty, Kuai Xiang, the designer of the Forbidden City, and others.

3. Zui

This is derived from the Jiang family and belongs to the Jiang family of the Qi Kingdom. The former site of Zhui is in today's Changqing County, Shandong Province. It was famous for its rich production of fat sheep. Therefore it is called "禚".

4. Xuan

The surname Xuan is a very old and rare surname in China. Due to different origins, the pronunciation is also different. One of them comes from Beigong Xuan, a descendant of the Yellow Emperor. , the pronunciation at this time is "Xuan", and the other one belongs to the surname given during the period of Emperor Guangwu of the Eastern Han Dynasty. Its ancestor was General Xun Chunwang, and the pronunciation at this time is "Qian".

5. Qu

The word "麴" is pronounced as "qu". According to "Zizhi Tongjian", "Hanshu", and "Yuanhe Surname Usuru", 麴 The original surname was "Ju". During the reign of Emperor Ai of the Western Han Dynasty, the minister ordered Ju Tan to change his surname to Qu to avoid disaster.