The name means consolation.
He was the seventh of the so-called minor prophets, an Elkoshite. All we know of him is recorded in the Book of Nahum.
He was probably a native of Galilee, and after the deportation of the ten tribes took up his residence in Jerusalem. Others think that Elkosh was the name of a place on the east bank of the Tigris, and that Nahum dwelt there.
Initial text from Easton's Bible Dictionary, 1897 -- Please update as needed