Siege in the name of Fang Hongjian Hongjian from what meaning?

Tang Dynasty tea saint Lu Yu, the word Hong Jian , its name out of the "I Ching", "Hong Jian son of Lu, its feather available for the instrument, auspicious."". Mr. Qian Zhongshu novel "Siege" in the main character Fang Hongjian, its name is also derived from the "I Ching", as at least an intellectual Fang Hongjian, Mr. Qian so for its name, but also on his identity.