We can change Oracle Database Name Manually without using nid utility.
In this video i am showing you we can change database name using modifying controlfile.
First we take a backup of controlfile.
alter database backup controlfile to trace as '/location';
Modify some parameter in this controlfile backup.
In the place of
Reuse Set
Old Database name New Database Name
Noresetlogs Resetlogs
It is very easy to understand. Follow this steps.