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Globally, Ilsen (Ilsen , Ильсен ) is a rare predominantly female, but very infrequently male forename. The first name Ilsen is characteristic of Latin America and the Caribbean, particularly Bolivia, where it is quite a rare feminine name, Nicaragua, where it is a rare girly name, and Argentina, where it is a very rare feminine name. Not in comparison with a country's population, it is commonest in Bolivia, Mexico, and Russia. Much less frequently, Ilsen is the last name as well as the forename.