The name Kallas comes from the area of today's Estonia. The name has spread about by the surge of refugees from East Prussia in Western Europe. The name Kallas means in Estonian means "bank" or "coast". Therefore it can be assumed that people have with that name once lived on the coast of the Baltic Sea. Kallas is still today a very ubiquitous name in Estonia. For example, well known by the former Estonian prime minister and current EU Transport Commissioner Siim Kallas.