Until 1961 the U-Bahn station was named Neukölln (Südring) to refer to the S-Bahn connection. However, Südring was removed from the name after the Berlin Wall was built.
Prior to the Berlin Wall, the U-Bahn station was known as Neukölln (Südring), a reference to its connection with the S-Bahn.  The removal of Südring from the station's name came about due to the construction of the Berlin Wall.