Did Isaiah even predict Cyrus' name 150 years ago?
There were two types of prophets: individual prophets and court prophets. For example, before Ahab went to war, 400 court prophets predicted Ahab's victory, but Michaya, an individual prophet, predicted his defeat. This is the fact that the king was training prophets under him.
The first part of the text of Isaiah must have been recorded by Isaiah, but the second half of Isaiah's book was to raise Cyrus as Jehovah's prophesied servant in appreciation of his achievements by court prophets who returned from later exile in Babylon. In doing so, it would have contributed to restoring their worship of Jehovah and promoting his outstanding abilities. One important reason for this view is that it is a mythological element that prophesied 150 years ago while specifying a person's name, and it is clear that such mythological elements are 100% ex-eventus prophecies. The true prophecy is only about very valid moral principles or natural phenomena. Therefore, in order to provide hope to humans, the Bible tried to increase its effectiveness by adding mythical elements that were used at the time, such as miracles or prophecies.