This emperor 's posthumous name must must have been regularized many centuries after the lifetime ascribed to KÅ an .
KÅ an is a posthumous name . It is undisputed that this identification is Chinese in form and Buddhist in implication , which suggests that the name must have been regularized centuries after the lifetime ascribed to KÅ an , possibly during the time in which legends about the origins of the Yamato dynasty were compiled as the chronicles known today as the Kojiki .