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Family name Lannoy (Lannoy , לנואה ) , around the world, is quite a common last name. The last name Lannoy is habitual in Aruba, where it is quite a common surname, Belgium, and France, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Western Europe, particularly France, Belgium, and Netherlands. Very seldom, Lannoy is the forename as well as the last name.