Apparently from H2986; the blast of a horn (from its continuous sound); specifically the signal of the silver trumpets; hence the instrument itself and the festival thus introduced: - {jubile} ram´ s {horn} trumpet.
Verse
Matrix
Gen 10:29And Ophir, and Havilah, and JobabH3103: all these were the sons of Joktan.
Jos 11:1And it came to pass, when Jabin king of Hazor had heard those things, that he sent to JobabH3103 king of Madon, and to the king of Shimron, and to the king of Achshaph,