There's a third party app in the Mac App Store that I made and might solve your problem -- if you're looking to give Spaces persistent names. It also tracks how you spend time across Spaces and your Apps, and gives you a way to jump directly between them.
The app's website is CurrentKey.com and here is the direct App Store link.
I launched the app in May and I'm already to version 2.2, working hard on a big 2.5 release. Because macOS APIs are limited, the names stay in the app and don't show up in Mission Control. But they are persistent.
Hope that helps! - Spencer