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How do I rename a group layer in ArcGIS Pro using ArcPy?

In ArcMap I can do so thus:

groupLayer = arcpy.mapping.Layer(r"Path to grouplayer.lyr")# empty group layer as template
groupLayer.name = some string
arcpy.mapping.AddLayer(dataframe, groupLayer, add_position='TOP')

I can't find an analogous way to do this in ArcGIS Pro:

glyr = arcpy.mp.LayerFile(r"Path to GroupLayer.lyrx")# empty group layer as template
glyr.name = some string
theMap.addLayer(glyr, add_position='TOP')

While the above code adds the group layer, it does not rename it, and it does not flag an error so I'm not really sure what is going on.

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Your glyr variable is a LayerFile object, not a Layer. It represents the file your group layer is stored in, not the group layer itself. Note that a layer file can contain multiple layers, eg:

enter image description here

The LayerFile object doesn't have a .name property and doesn't raise an error when setting a non-existent property. You could do this and nothing would happen:

glyr.foo= "bar"
glyr.name = "some string"
glyr.another_nonexistent_property = "nothing"

Your group layer is a Layer in the LayerFile, and you can access it using the .listLayers() method, e.g.

lyr_file = arcpy.mp.LayerFile(r"path to.lyrx")  # LayerFile object
group_layer = lyr_file.listLayers("Your template Group Layer name")[0]  # Layer object
group_layer.name = "An Updated Name"
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