Nathan-melech is described as one of Josiah's officials in 2 Kings 23:11 of the Hebrew Bible. He lived near the entrance to the temple, close to the courtyard where the horses had been kept that were used in sun-worship before Josiah disposed of both the horses and the chariots that they had pulled.
Nathan-melech means King's gift. Some authorities have regarded the name as a variant of Nathan but this is no more valid sociolinguistically than regarding Nathanael as a variant of Nathan, or Rosemary as a variant of Mary. They are distinct names.