What was XXX's child's name?
Achaemenes
In the Behistun inscription (c. 490 BCE), Darius I portrays Achaemenes as the father of Teispes, ancestor of Cyrus II (Cyrus the Great) and Darius I. The mid-5th century BCE Histories (7.11) of Herodotus has essentially the same story, but fuses two parallel lines of descent from ``Teispes son of Achaemenes''.
Teispes