Why is it called guiguzi?

Guiguzi, surnamed Wang, (or Li), was a singer in the Spring and Autumn Period. He often goes to Yunmeng Mountain to collect herbs and cultivate monasteries. Because he lives in seclusion in Qingxi Guigu, Zhouyangcheng, he calls himself Mr. Guigu. "Wang Chan's bodhi old zu" is the name of Guiguzi by later generations, and it is one of the pre-Qin philosophers. Gui Guzi is the originator of a military strategist (in fact, he is one of the famous representatives of a military strategist), and Su Qin and Zhang Yi are his two most outstanding disciples (see Warring States Policy). In addition, Sun Bin and Pang Juan are also disciples (see The Romance of Sun Pang). He knows what's going on in the world, taking into account mathematics, and no one can be better than him. Theology: astrology, divination and gossip, accurate budget, very accurate; Second, military science, six towers and three strategies, endless changes, marching in array, unpredictable ghosts and gods; The third is to study abroad, remember more and listen more, judge the situation rationally, export as a chapter, and it is difficult for ten thousand people; The fourth is to learn from birth, cultivate self-cultivation, get rid of illness and prolong life, and be pedantic and profound.