Hello @Yogesh Burud 

You can refer the document: https://documentation.commvault.com/2022e/expert/4870_updating_client_properties_for_multiple_clients_using_command_line_interface.html

Please make extra caution while changing the names and since you are doing it for the first time, please perform it in a test environment. 

You can also refer to the thread: 

 Best,

Rajiv Singal

@Yogesh Burud 

Please check this. You can change the client hostname from Commcell console or by using Command Line Interface locally.
 
On Commcell Console:

https://documentation.commvault.com/2022e/expert/7037_changing_host_name_of_client_computer.html
 
Using Command Line Interface

:https://documentation.commvault.com/2022e/expert/7051_changing_client_computer_name_using_command_line_interface.html

The command must be executed locally and cannot be used to change the name of a remote computer.

Note: Currently, there is no way to change the hostname in bulk. There are only 2 ways as mentioned above

@Yogesh Burud 

Maximum you can try is keep the script with different value on a txt file and save that TXT as a .bat file.

Run the bat file so it will applicable for all.