Throughout the world, Niels-Erik (Niels-Erik 
) is a very rare male first name. Parts of the name also exists independently as a first name Niels, and a first name Erik.
| VARIANT | COUNTRY |
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| Niels-Erik | United Kingdom, United States, Germany, Denmark |
| niels-erik andreasen Professor of Old Testament studies, DK (b. 1941) |
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| niels-erik viby researcher |
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| niels-erik clausen researcher ORCID ID = 0000-0003-2251-4865 |
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| niels-erik b jacobsen researcher |
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Ravn, Edlefsen, Ernlund, Andersen, Pedersen, Espenhein, Villadsen, Frandsen, Mortensen, Schollert, Sørensen, Oldenburg, Wischmann, Kristensen, Zimmermann, Øhlenschlæger, Nijkamp, Nielsen, Lomholt, Poulsen, Lund, Juul, Stahl, Svahn, Kvist, Galst, Olsen, Christensen, Bøchman, Larsen, Jensen, Tregde, Hansen, Halgaard, Møller, Clausen, Parbst, and Kristiansen