So, if you do find yourself in a situation where you want to rename your region, there is a simple way to do so.
And no, there is NO "cicscp restart region blah blah ... "
Here is how you do it :
1) Navigate to CICSREGIONS directory which is /var/cics_regions on Unix systems and C:\var\cics_regions in Windows
2) Run the following command :
" cicsexport -r (Your Region Name)
Example : cicsexport -r Arena -o OutFile
This should ensure that an output file is created which contains all your region information. Now this regions is shippable to any other machine in a CICS understandable format.
3) Now Run this Command :
Example : "cicsimport -r ARENA -i OutFile"
Take Care that the file in -i option is the same file you created with cicsexport.
4) Now start your region using this command :
"cicscp start region ARENA StartType=cold"
Note : Did you notice that the region names are case sensitive? This might be a reason to rename your regions in case you want it to Communicate with a region on CICS on z/os.
You have now renamed your region! Good to go.