Choi source out there are three:

1, from jiang to city called surname.According to the new tang book · prime minister genealogy table "and" yuanhe surname code "and so on data contained in, yan emperor shen nung descent, the western zhou dynasty king qi Ding Gong Ji office of plum had food taken from Cui Yi (now shandong zhangqiu), for city's sons; for the shandong choi.According to the record of a variety of ancient books, chey from jiang.Qi choi from the western zhou dynasty, has a history of nearly three thousand years, had long is shandong family and the family name in China.One of the important vassal states of qi is the early western zhou ji fa herod, based in (now shandong zibo), is the founding monarch lu shang.Lu shang originally surnamed jiang, because his ancestors were sealed in lu (now in henan province nanyang), from its name, is called lu shang.The son of lu shang Ding Gong Ji, king is the second generation of the qi, his DiZi plum, should inherit jun, but has given way to a brother uncle b (b), while their live feed to the manor Cui Yi (now shandong zhangqiu northwest), later for city's just yet.And the Ding Gong Ji, according to legend is little son tooth's son.Chey, therefore, the Chinese is derived from the little direct descendants, tracing or ancient culture and of the sons of the emperor shen nung.Their family name, consisting of about 3000 more than one thousand years old.

2, according to the new tang book ", tang woosong state-owned choi, inheritance to the modern, south Korean choi.

3, from the minority choi:

(1) of manchu surname choi, tieling north song nuzhen, were swallowed after biting, cui, cui cui as surname.Including manchu old surname: Cui Mulu, Cui Jiashi, Cui Zhu gram

(2) this yi, hui, Mongolian, soil, etc all have choi.