Man pages matching name geoip2::database::reader in section 3pm:

GeoIP2::Database::Reader.3pm.en	debian 10 / libgeoip2-perl
GeoIP2::Database::Reader.3pm.en	debian 11 / libgeoip2-perl
GeoIP2::Database::Reader.3pm.en	debian 12 / libgeoip2-perl