Nahum is the Book of Jonah, Part Two. The LORD had graciously spared Nineveh because of their humble repentance. On this occasion there will be no repentance, and no sparing of Assyria.
The Hebrew, Greek, and English titles for the book are all taken from the proper name of the prophet who delivered the message of this book.
The only thing we know about Nahum the Elkoshite is that he was an Elkoshite (Nah. 1:1). Elkosh is an otherwise unknown location. It does not appear anywhere in the Bible. Various suggestions have been offered for its location, including Galilee. Capernaum is thought by some to be kephar nachuwm (village of Nahum), but this etymology is not certain. Other traditions make Elkosh a Simeonite town in Judah, a village in Syria, and even an Assyrian town near Nineveh. The name Nahum means “comfort.”