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"Kai-shek"/"Jieshi" soon became Chiang's courtesy name (). Some think the name was chosen from the classic Chinese book the "I Ching"; , is the beginning of line 2 of Hexagram 16, "". Others note that the first character of his courtesy name is also the first character of the courtesy name of his brother and other male relatives on the same generation line, while the second character of his courtesy name "shi" (—meaning "stone") suggests the second character of his "register name" "tai" (—the famous Mount Tai). Courtesy names in China often bore a connection with the personal name of the person. As the courtesy name is the name used by people of the same generation to address the person, Chiang soon became known under this new name.