Man pages matching name net::idn::nameprep in section 3pm:

Net::IDN::Nameprep.3pm.en	debian 10 / libnet-idn-nameprep-perl
Net::IDN::Nameprep.3pm.en	debian 11 / libnet-idn-nameprep-perl
Net::IDN::Nameprep.3pm.en	debian 12 / libnet-idn-nameprep-perl