Conny Genko is a Brazilian jiu-jitsu black belt and coach associated with Ataque Duplo Hannover in Germany. Also listed publicly as Constanze Sarah Genko, she has a public training record dating back to 2011, with subsequent promotions at Ataque Duplo Hannover. Her public belt record lists Douglas Mayer as her black-belt promoting instructor in June 2025. She trains both gi and no-gi and is named on the teaching roster for BJJ Globetrotters Zen Camp 2027.
