Man pages matching name domainname in section 1:

domainname.1.en	debian 10 / hostname
domainname.1.de	debian 10 / manpages-de
domainname.1.es	debian 10 / manpages-es-extra
domainname.1.ja	debian 10 / manpages-ja
domainname.1.pl	debian 10 / manpages-pl
domainname.1.tr	debian 10 / manpages-tr
domainname.1.en	debian 11 / hostname
domainname.1.de	debian 11 / manpages-de
domainname.1.es	debian 11 / manpages-es
domainname.1.ja	debian 11 / manpages-ja
domainname.1.pl	debian 11 / manpages-pl
domainname.1.tr	debian 11 / manpages-tr
domainname.1.en	debian 12 / hostname
domainname.1.de	debian 12 / manpages-de
domainname.1.es	debian 12 / manpages-es
domainname.1.ja	debian 12 / manpages-ja
domainname.1.pl	debian 12 / manpages-pl
domainname.1.tr	debian 12 / manpages-tr