The “About the system” menu does not list the name of the current (Mercury Neo) operating system. It should be listed, otherwise it is not clear what is installed.
It should be clear if you installed it. 
EndeavourOS doesn’t have versions. It is rolling.
That identifier mainly refers to the ISO it was installed from. Once the system is installed, it is all the same.
It will be more informative. I understand that it’s rolling 
then as long as your updated then it doesn’t matter your on the latest this isn’t like static release that use version numbers
Welcome to the forum 
Mercury Neo is not the name of the system, it is just the name of the ISO.
I never installed EOS from the latest ISO , and I still have the most recent version of EOS.
Following your logic my system would still have the name of the older ISO I have installed it from, which ofcourse is not the case because it is not important.
I’ve already surpassed Neo! I keep rolling! 
Yes we on our way to the next planet …engage. 
This is not my logic :). You have the latest version because you updated. The name of the old version - if you did not update.
I hope there is a mechanism to avoid errors for those who update very rarely. I just want the name of the operating system version.
You get version names confused with ISO names. The ISO names are used to indicate that there is a new ISO available to install from for people that install EOS for the first time, and contains some improvements compared to the earlier install ISO.
The version name is, and will always be EOS, no matter if you update or not.
This is arch There are Updates DAILEY. Maybe EndeavourOS isn’t for you. We are in line with what Arch Linux Does.
See here to learn more about Arch Linux
Go here for EndeavourOS specific
https://discovery.endeavouros.com/
And it tends to go badly for those that don’t update (when they do finally update). It’s not that the failure to update that breaks it, it’s mostly the failure to be aware of any gotchas in the massive massive update.
If you intend not to update regularly and often, then an Arch Linux based system is not for you. The name of the operating system is EndeavourOS, that does not change with ISOs or updates.
It’s sad. Soon I will be able to update only once every 2 months. I am happy with the operating system, everything that is needed works.
You are really complaining about how it is named in the “about the system” settings ? 
Yes.
There is no name of the operating system version. This is because there is no version in the first place.
When you update you don’t go from running one version to another.
It is only the ISOs themselves that have names.
This thread has established that the operating system remains simply EndeavourOS even as new ISOs with different names are released. However, you can get an approximation of what you want as follows…
Create this file if it does not exist already:
~/.config/kcm-about-distrorc
Add this content to the file and save:
[General]
Version=Mercury Neo
Reopen About this system. You will see the version name displayed prominently.
Even if there has been a newly named ISO released during those two months, you still won’t need to upgrade the operating system to a new version. Simply performing an ordinary update will give you the latest versions of all the software present in the the ISO (as well as any software updates released after the ISO release). However, if you want About this system to reflect the name of the latest ISO, you can perform again the edit I described above.
First of all welcome @TorquemadaKotez to the wonderful world of EndeavourOS and Linux perhaps. I see this is your first post.
So, allow me to explain as far as I understand.
Well, think of something like the old Windows 98. After a few years came out I think Windows XP that requires reinstalling the whole OS and backing up your data then copying it again back, then a newer version that needs the same to be repeated.
In other Linux distros they do the same but most now allow you to install or upgrade in place to the newer “version”
But it is different with any rolling release.
A rolling release means you install the system from the ISO and that ISO is called Y. This Y is just a reference to what it was and when.
Think of your friend who a few months ago installed from an ISO called X (before your Y). You will be installing “EndeavourOS” from ISO Y, but your friend who previously installed the same “EndeavourOS” from ISO X, if he does an update to his system he will simply get the same “EndeavourOS” you get from ISO Y.
So, in a rolling release there are no versions really, it is just updates, as updates keep coming all the time, daily perhaps. It is just updates.
But you may ask why then they release ISO X then ISO Y then ISO Z later on.
There are 2 reasons I think of. Imagine (though what I am saying is not technically correct 100%, you will know why in the next sentence.), imagine how big would be the updates from version X to Y, then from X to Z, and so on. So, developers do ISOs for people who will be installing for the first time a snapshot of the “EndeavourOS” with the latest updates, so he downloads only 3 or 4 GB and install from it, rather than downloading this 4 GB (ISO X), then another 4 GB to get ISO Y, then another 4 GB to get ISO Z (the latest snapshot)
So actually as it is a rolling release, once you install once you will normally get just updates as you update any OS, so the user who installed from X will not be installing Y or Z ever. He will be simply getting updates only.
Saying this another way, there can be a new ISO with a new name every single day. But this is not practical.
So, finally the operating system you are running is just EndeavourOS, you and the guy who installed from the X ISO, or when you update when the Z ISO comes out. All will be having just EndeavourOS.
Now I have to say, as far as I learned here you should update your system at least every 2 weeks else you may run into trouble.
There is no name of the operating system version. It’s just endeavourOS. The ISO’s have a name because they get changed when they are updated. It makes absolutely no difference to the user because when you update you have exactly the same installed system. It’s rolling and you get all the updates as has been explained.