Last name Terach (Terach 
) , across the world, is a very rare family name. The family name Terach is habitual in Israel, where it is a very rare surname, the United States, where it is an extremely rare surname, and Argentina. Measured by absolute frequency, it is the most numerous in the United States, India, and Israel. Much more prevalently, Terach is the forename as well as the last name.