Jiang Ziya
One origin of the surname came from descendants of someone who originally held the Jiang (姜) surname in the state of Qi, founded by Jiang Ziya (姜子牙). A grandson of Jiang Ziya named Jizi (季子), an heir apparent, chose to relinquish his claim to the throne in favour of his brother Shuyi (叔乙), and went to live in the Cui estate (崔邑, in present-day Shandong). His descendants later adopted Cui as their surname.