Man pages matching name cp1251 in section 7:

cp1251.7.en	debian 10 / manpages
cp1251.7.ja	debian 10 / manpages-ja
cp1251.7.en	debian 11 / manpages
cp1251.7.es	debian 11 / manpages-es
cp1251.7.fr	debian 11 / manpages-fr
cp1251.7.ja	debian 11 / manpages-ja
cp1251.7.en	debian 12 / manpages
cp1251.7.de	debian 12 / manpages-de
cp1251.7.es	debian 12 / manpages-es
cp1251.7.fr	debian 12 / manpages-fr
cp1251.7.ja	debian 12 / manpages-ja
cp1251.7.ru	debian 12 / manpages-ru