The reason why the number of people born at the same time as Wuxu, Geng, Shen, Guisi and Dingsi is relatively small is that this combination represents a specific year and zodiac combination. Wuxu, Gengshen, Guisi and Dingsi are all combinations of Heavenly Stems and Earthly Branches in the lunar calendar, and they represent different years and zodiac signs respectively. Specifically, Wuxu represents the Jiaxu year, Gengshen represents the Yiyou year, Guisi represents the Bingwu year, and Dingsi represents the Dingsi year. Since the combinations of zodiac signs and heavenly stems and earthly branches are limited in each year, the number of people who have all four heavenly stems and earthly branches at the same time is relatively small. In addition, the combination of heavenly stems and earthly branches in the lunar calendar is also related to numerology, which is said to have an impact on an individual's personality traits and destiny. Therefore, people born at the same time as Wuxu, Geng, Shen, Guisi and Dingsi may have similar characteristics and destiny trends in some aspects. But please note that this is just a traditional concept and cannot completely determine an individual's destiny and character.