a German word, meaning "to". As part of a family name, it can indicate belonging to the nobility and posession of a place, estate etc.; see also: Von
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Zu Chongzhi (祖冲之, pinyin Zǔ Chōngzhī, Wade-Giles Tsu Ch'ung-chih) (429-500) was a Chinese mathematician and astronomer during the Song and Qi Dynasties (of the Southern Dynasties).
To flee from the ravages of war, Zu Chongzhi's grandfather Zu Chang moved from Hebei, in north China, to south of the Yangtze River, as part of the massive population movement during the Eastern Jin Dynasty.
Zu Chang at one point held the position of "Minister of Great Works" (Dàjiàngqīn) within the Song Dynasty (420-479) and was in charge of government construction projects.