Man pages matching name locale::recodedata::ecma_cyrillic in section 3pm:

Locale::RecodeData::ECMA_CYRILLIC.3pm.en	debian 10 / libintl-perl
Locale::RecodeData::ECMA_CYRILLIC.3pm.en	debian 11 / libintl-perl
Locale::RecodeData::ECMA_CYRILLIC.3pm.en	debian 12 / libintl-perl