Sorry Ian, not sure about this. Sounds like a question for Garmin maybe?
I have a Garmin Edge Tourer. I am able to download routes to my laptop and give them appropriate titles.
When I transfer the route to my Garmin, however, they appear on my list of "saved courses" as "unnamed route" - the title I had previously given the route on my computer having disappeared
The route information(map etc) is available but I wish to give the route an appropriate title.