What do you think of worlds having an encompassing name and logo?

What do you think of having a marketable name and/or logo for your settings to represent everything in it? I understand this for products like Dune, Star Wars and The Legend of Zelda, but what about your personal works? Do you see it as necessary if it's just for yourself and nothing too serious?

If you chose to give a name or logo, how did you go about designing them? What was the reason you chose the name, logo or even the decision to make them? How did you decide what, of possibly many different things, to emphasize in the name and what to drop?

I'm bad at naming generally. I think for a few years now, I worked with the name "Valley of Emperors", which I may still use for the region itself. Recently, the name "Gears of Bronze" came to mind to possibly use for the whole setting including other regions. I thought of what a logo could look like, but I'm not sure how I would decide on a design and what elements to put in it. I thought of having at least a bronze age weapon to show the primary inspirations and some kind of gear or machinery to represent the recent introduction of advanced machines.

What are your thoughts on the idea of names and logos for your worldbuilding? Were there any you liked? Did you decide you didn't need one or either of these?