Man pages matching name jack_unload in section 1:

jack_unload.1.en	debian 10 / jackd1
jack_unload.1.en	debian 10 / jackd2
jack_unload.1.en	debian 11 / jackd1
jack_unload.1.en	debian 11 / jackd2
jack_unload.1.en	debian 12 / jackd2