surname Xiao; Taiwan pr. [Xiao4]
Depicts the moon (月) getting smaller (小) and disappearing as part of the lunar cycle. Based on the original meaning "decrease, disappear", now written as 消. The meaning later shifted to "resemble; similar".
《說文》：“肖，骨肉相似也。从肉，小聲。不似其先故曰不肖也。”
decrease, disappear