This is a plugin for uLauncher that lets you search & switch between Linux/X11 Workspaces by name:
The default keyword in w, so just run Ulauncher, then type w <query> to filter the workspace list, then select a workspace from the list to switch to that workspace.
If you type <keyword> -, it'll offer to take you back to your previous workspace - i.e. the one you were on before this one. It will save the current workspace into $HOME/.lws just before switching, so this will only work if you use this switcher - it won't know about workspace switches you make by other means. This is intended to work similarly to cd -, or pushd/popd.
If you type a number, e.g. <keyword> 12 it'll offer to take you directly to workspace 12.
I used workspace icons from the Obsidian Icon pack
You need wmctrl installed. See: https://www.freedesktop.org/wiki/Software/wmctrl/
For Debian/Ubuntu, you can do:
$ sudo apt install wmctrl