As this is a cluster it will need to be the Virtual network name. This is a named instance which have this format:

Networkname\instancename

the new name will be:

NewNetworkname\instancename or should it be NewNetworknameewinstancename I want no name conflist

Basically I will migrate my systems from SQL Server 2005 to SQL Server 2008 R2 different cluster. And we need to keep the same instance name on the new servers so we need to remove from the dns the current names and also rename the instances before the new SQL Server 2008 installation.

We have the sql server 2005 clustered instance and a sql server local instance to migrate

Thanks