To see the class name in the legend for a classed post map:

1. Select the legend.
2. Click on the Layers tab in the Properties window.
3. If you have more than one layer in your legend, choose your classed post map from the Layer to edit dropdown list in the Layers in Legend section.
4. In the Classed Post Layer section, type \name in the Template field where you want the class name to appear.
5. Press ENTER on your keyboard and the legend will update to include the class name.

See How can I edit the labels in the legend for a classed post map in Surfer? for more information about editing classed post layer legend entries. 

Updated 3.29.19