Last name טונדר (Tunder 
, טונדר 
) , across the world, is a rare family name. The surname טונדר is habitual in Estonia, where it is quite a rare surname, Romania, where it is a rare surname, and Hungary. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Romania. Much less frequently, טונדר is the forename as well as the last name.