Hello SHANMUGAM_156,
Thank you for posting in Microsoft Community forum.
Here is a similar thread with the suggestion you want for your reference.
Internal Domain Rename - Microsoft Q&A
If your AD environment is more complex, it is recommended you would probably just create a new domain and move or migrate everything to new domain if needed.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou