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Across the world, Gielen (Gielen
, גילן
, جيلين
) is a very rare epicene forename. The first name Gielen is habitual in Belgium, where it is a rare gender-neutral name, Philippines, where it is a very rare girly name, and Brazil, where it is an extremely rare female name. Much more frequently, Gielen is the last name as well as the forename.