A possible Egyptian background to Isaiah 9:5 is reviewed in the light of a text from Deir el-Bahari in which Thutmose I announces to his courtiers and to the people that Hatshepsut will be his heir. Only four of Hatshepsut’s names are proclaimed, since she already bore the fifth name, her nomen Hatshepsut, given to her at birth. The text does not link her nomen with the Son of Re title, since only the reigning king could be defined as Re’s son. This assessment of the Hatshepsut text also supports the interpretation that the Isaiah text, which has the same sequence of events, refers to the proclamation of a crown prince rather than to an accession to the throne. It is further argued that the understanding of the nature of the Egyptian king’s relationship to the deity in the New Kingdom would not have precluded it from serving as a model for Israelite kingship.