Man pages matching name getgrnam_r in section 3:

getgrnam_r.3.de	debian 10 / manpages-de-dev
getgrnam_r.3.en	debian 10 / manpages-dev
getgrnam_r.3.ja	debian 10 / manpages-ja-dev
getgrnam_r.3.pl	debian 10 / manpages-pl-dev
getgrnam_r.3.de	debian 11 / manpages-de-dev
getgrnam_r.3.en	debian 11 / manpages-dev
getgrnam_r.3.fr	debian 11 / manpages-fr-dev
getgrnam_r.3.ja	debian 11 / manpages-ja-dev
getgrnam_r.3.pl	debian 11 / manpages-pl-dev
getgrnam_r.3.de	debian 12 / manpages-de-dev
getgrnam_r.3.en	debian 12 / manpages-dev
getgrnam_r.3.fr	debian 12 / manpages-fr-dev
getgrnam_r.3.ja	debian 12 / manpages-ja-dev
getgrnam_r.3.pl	debian 12 / manpages-pl-dev
getgrnam_r.3.ru	debian 12 / manpages-ru-dev