A form is initially named when it is created, as a required step in the process of creating a new form. The form can be renamed from within the form builder using the form settings; however, this practice is discouraged. It is best practice to rename a form using the Edit Name button for the form in the list of forms created using the event pages, profile pages, databases or related entity modules.
Be aware that when a form is renamed, any other forms which contain references to that form by its name will lose their connection and need to be repaired by resetting the properties of the inForm report, inForm chart, linked calculation or other means of referencing data from within the form you are renaming.
Form names are visible in the user interface so it is helpful to users if forms are identified according to their purpose or intention.