Man pages matching name sethostname in section 2:

sethostname.2.de	debian 10 / manpages-de-dev
sethostname.2.en	debian 10 / manpages-dev
sethostname.2.es	debian 10 / manpages-es
sethostname.2.ja	debian 10 / manpages-ja-dev
sethostname.2.pl	debian 10 / manpages-pl-dev
sethostname.2.de	debian 11 / manpages-de-dev
sethostname.2.en	debian 11 / manpages-dev
sethostname.2.ja	debian 11 / manpages-ja-dev
sethostname.2.nl	debian 11 / manpages-nl-dev
sethostname.2.pl	debian 11 / manpages-pl-dev
sethostname.2.de	debian 12 / manpages-de-dev
sethostname.2.en	debian 12 / manpages-dev
sethostname.2.ja	debian 12 / manpages-ja-dev
sethostname.2.nl	debian 12 / manpages-nl-dev
sethostname.2.pt_BR	debian 12 / manpages-pt-br-dev
sethostname.2.ru	debian 12 / manpages-ru-dev