2 occurrences in 2 dictionaries
Reference: Nathan-melech
Fausets
A eunuch or chamberlain in Josiah's court, by whose chamber at the entering in of Jehovah's house, in the suburbs, were the horses sacred to the sun; these Josiah took away and burned the sun chariots with fire (2Ki 23:11).
Hastings
An official in the reign of Josiah, whose name is used to designate one of the halls or chambers of the Temple (2Ki 23:11).