BSV are initials often adopted by German sports clubs, the SV standing for Sportverein or Spielverein:
Berliner SV 1892 (Berliner Sport-Verein)
Berliner SV 92 Rugby (Berliner Sport-Verein)
BSV Kickers Emden (Barenburger Sportverein)
BSV 98 Bayreuth which merged with 1.