Patronymic of the family of Jether
Ira an Ithrite, Gareb an Ithrite, (2 Samuel 23:38)
And the families of Kirjath-jearim; the Ithrites, and the Puhites, and the Shumathites, and the Mishraites; of them came the Zareathites, and the Eshtaulites. (1 Chronicles 2:53)