Man pages matching name setproctitle_init in section 3bsd:

setproctitle_init.3bsd.en	debian 10 / libbsd-dev
setproctitle_init.3bsd.en	debian 11 / libbsd-dev
setproctitle_init.3bsd.en	debian 12 / libbsd-dev
setproctitle_init.3bsd.en	debian 13 / libbsd-dev