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This is because arcpy.Rename_managementarcpy.Rename_management does not work on a map layer object - it works on objects on the disk.
Instead try:
layer.name = newName
layer.name is a read/write attribute of the arcpy.mapping.Layer class.
layer.name
This is because arcpy.Rename_management does not work on a map layer object - it works on objects on the disk.
