refers to his status as the oldest son of his father;   may have been his personal name's element or a posthumous name used for ritual purposes;  either means "long-lived" or is a posthumous epithet used to refer to a deceased father.
indicates his status as the eldest son of his father; could be an element of his given name or a posthumous title for ceremonial purposes; either means "long-lived" or is a posthumous designation for his deceased father.