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Family name Maertens (Maertens
, Мартенс
, Мертенс
) , in the world, is quite a common cognomen. The family name Maertens is characteristic of Belgium, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and France. Measured by absolute frequency, it is commonest in Belgium, France, and Russia. Very seldom, Maertens is the forename as well as the last name.