lvalue clashes with Lvalue.  Lvalue wins.

lvalue has only one release.
macro and Macro clash.  macro wins.

They're both well developed.  macro is more recent.
More dist name case normalizations.
Marc clashes with MARC.

MARC is a well developed ecosystem.  Marc-0.005 seems to have figured this out and
moved into the MARC::Moose namespace.  So Marc is renamed MARC-Moose.
More dist name case normalization.
MCrypt and Mcrypt clash.  Mcrypt wins.

Both are developed and basically do the same thing.  Mcrypt is more recent.
More dist name case normalizations.
authors/id/C/CH/CHTTRAX/mirror-1.11.tgz contains junk.

"mirror" files, not a module.
Mobile-WURFL and Mobile-Wurfl clash.  Mobile-Wurfl wins.

Both are developed.  Mobile-Wurfl has more and more recent releases.
More dist name case normalizations.
Clashes with Mojolicious-Plugin-YamlConfig and only has one release.
More dist name case normalizations
These are non-Perl software releases.
These all clash with Stevan Little's mop project.

They're one off releases and Stevan's mop project is more important.
More dist name case normalizations.
mpp is the same as makepp.
Msql-Mysql-modules became DBD-mysql.

Don't know what happened to DBD::msql.
More dist name case canonicalization.
Nagios-NRPE

This is a tough one.  Both Nagios-NRPE and Nagios-Nrpe are recent,
well developed modules.  There is no clear winner.

I chose to rename the newer one (who should have done the research to look
for a namespace clash) to append their CPANID so the history is in gitpan.

I informed both authors about the problem.
https://rt.cpan.org/Ticket/Display.html?id=99485
This is actually DBIx::Namespace

There's also a CPWILLMOT/DBIx-Namespace-0.04.tar.gz  This author
does not own the namespace, but I can't find another copy of it.