object_name.py

import bpy
from bpy.props import StringProperty
 
class ObjectRenameOperator(bpy.types.Operator):
    bl_idname = "object.rename_object"
    bl_label = "Rename Active Object"
 
    my_string = StringProperty(name="String Value")

    def draw(self, context):
        l = self.layout
        c = l.column()
        c.label(context.active_object.name)
        c.prop(self, "my_string", text="new name")
 
    def execute(self, context):
        context.active_object.name = self.my_string
        msg = "done!"
        self.report({'INFO'}, msg)
        return {'FINISHED'}
 
    def invoke(self, context, event):
        return context.window_manager.invoke_props_dialog(self)


def register():
    bpy.utils.register_class(ObjectRenameOperator)

def unregister():
    bpy.utils.register_class(ObjectRenameOperator)


if __name__ == "__main__":
    register()