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All over the world, Cöllen (Cöllen ) is an extremely rare unknown gender forename. Much more prevalently, Cöllen is the last name as well as the forename.
Coellen, and Kölle
Hans, Sebastian, Wolfgang, Gabriela, Vincent, Gundula, Barbara, Christa, Engelbert, Andreas, Oliver, Evelyn, Dieter, Renate, Robert, August, Claus, Michael, and Franziska