Man pages matching name test::cleannamespaces in section 3pm:

Test::CleanNamespaces.3pm.en	debian 10 / libtest-cleannamespaces-perl
Test::CleanNamespaces.3pm.en	debian 11 / libtest-cleannamespaces-perl
Test::CleanNamespaces.3pm.en	debian 12 / libtest-cleannamespaces-perl