Well here it goes. One thing I can confirm is that your greatx99 grandfather “appeared” earlier than my greatx80 grandfather as he only “appeared” in Zhou Dynasty (the dynasty after Shang). And – after reading the rather ordinary origin of my surname, can I now blame my surname for my ordinariness?

From Wikipedia:

“The Cais are said to be the descendants of the 5th son of King Wu of the Zhou Dynasty (9th century BC – 256 BC), Ji Du. Ji Du was awarded the title of marquis (hóu) of the State of Cai (centered on what is now Shangcai, Zhumadian, Henan, China), and he was known as Cai Shudu (“Uncle Cai”). Together with Guan Shu and Huo Shu, they were known as the Three Guards. When King Wu died, his son King Cheng was too young and his uncle, the Duke of Zhou, became regent. Seeing that the power of the Duke of Zhou was increasing, the Three Guards got jealous and rebelled against Zhou together with Wu Geng. The Duke of Zhou suppressed the rebellion, and Cai Shu was exiled. King Cheng reestablished Cai Shu’s son Wu as the Duke of Cai. Some 600 years later in the Warring States Period, the State of Chu conquered Cai in 447 BC and was itself conquered by the Qin state which, in turn, formed the Qin Empire, China’s first empire. With the spread of family names to all social classes in the new empire, many people of the former state of Cai began to bear it as a surname.”