Is there a way of changing a SharePoint folder name ?

Yes , we can update folder name using update folder metadata integration

in the folder path you can specify the path of the folder which you wanted to rename and the meta data you can pass  as below

a!toJson(
{
"__metadata": { "type": "SP.Data.DocumentsItem" },
/* ri!newFloderName - new foldername which you would like  to provide*/
"Title": ri!newFolderName,
"FileLeafRef": ri!newFolderName
}
)

Yes , we can update folder name using update folder metadata integration

in the folder path you can specify the path of the folder which you wanted to rename and the meta data you can pass  as below

a!toJson(
{
"__metadata": { "type": "SP.Data.DocumentsItem" },
/* ri!newFloderName - new foldername which you would like  to provide*/
"Title": ri!newFolderName,
"FileLeafRef": ri!newFolderName
}
)

Thanks for your answer shivanireddys

May I ask what is "FileLeafRef"?