heir (EN)
noun

noun “heir”

sg. heir, pl. heirs
  1. a person who will receive money or possessions from someone else when that person dies
    After their grandfather passed away, Maria became the heir to his entire estate.
  2. a person who will receive a special rank or position (like a king or queen) after the end of the reign of the current holder
    The young prince was the heir to the throne, destined to become king one day.