Surname Siminas (Siminas 
) , in all the world, is a very rare cognomen. The family name Siminas is characteristic of Greece, where it is a rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Greece, the United States, and India. Very seldom, Siminas is the forename as well as the last name.