How to rename the group name in confluence

[Siva Kumar Veerla]

I am not able rename existing group

[Nic Brough -Adaptavist-]

Groups cannot be renamed in Confluence.

[Kyle Reeves]

make it not be that way then.

[Nic Brough -Adaptavist-]

You'll need to ask Atlassian to do that.  See what @Felipe Kraemer  said!

[Dang Thi Thuy Tien]

Hi hi, 
We are happy to introduce you this app, can help you rename in the confluence. 
You can have a look ;) 
https://marketplace.atlassian.com/apps/1236396/group-master-for-confluence?hosting=datacenter&tab=overview

And other advanced group management capabilities:

• View group usage across Jira
• Edit group names for clarity
• Move or copy group members easily
• Replicate or migrate group usage
• Delete groups and clean up associated data  

[Felipe Kraemer]

While it is not yet possible to rename groups using the Confluence web interface (request being tracked at CONFSERVER-9159), it is possible to rename groups and preserve their permissions by following the steps from this article:

How to rename a group and preserve its permissions