The origin of the word Yin?

Detailed word meanings

褤yìn 〈动〉

1. (Knowing. From the flesh, from the eight, from the unitary. The flesh represents the blood relationship, and the unitary represents the importance. Die, eight means extension. Original meaning: descendants inherit each other. Same as original meaning. ——"Shuowen"

Yu Naiyin protected the Prime Minister Dongtu. ——"Book Luo Hao"

Yin, Jiye. ——"Erya"

Yin Yinzhou became unemployed. ——"Ju Qin Meixin"

1. Descendants, descendants, heirs, descendants [descendent; offspring]

Yinzi Zhu Qiming . ——"Book·Yao Dian"

Husband Xu is the Yin of Taiyue. ——"Zuo Zhuan·The Eleventh Year of Yin Gong"

Zhou Gong Zhiyin. ——"Zuo Zhuan·The Twenty-Fourth Year of Duke Xi"

Yongxi Zuoyin. ——"Poem Daya·Ji Zui" 2. Another example: Yinzi (son; heir); Yinxi (son; heir)