Differences between Login and Logon

Have you ever wondered why there so many inconsistencies even from me in these blog postings about the word login? In some blog posts, I refer to Login and Logon even log in when my grammar editor thinks me dull.
And apparently this conundrum goes way round when terminating or quitting a process. I am talking signing off;
LogOff
LogOut
SignIn
SignOut
Which one is which now, Login vs LogOn and LogOff vs LogIn?
From a technical computer point, the login and logon are terms defined in the .NET framework. All ASP.NET controls use the terms ‘Login’ and ‘Logout’ consistently. But Microsoft internally throws the words around and are not localized.
Even Google and indeed the rest of the world use these as they please. Though CA1726 a “Microsoft technical writing style guide” insists on LogOn over LogIn.
I feel logOn for Microsoft comes fore because it sounds natural.
However, here is some voice of democracy from Google knowing search algorithms both now and 11 years ago.
login 5,780,000,000 sign In 16,180,000,000 logon 276,000,000 log on 19,550,000,000
login wins because sign in and log on reflects what’s been typed in the Google search while login(5,780,000,000) and logon(276,000,000) are forms Google search is able to find.
10 years ago
login 2,020,000,000 sign in 430,000,000 logon 27,700,000 log on 18,200,000
logout 83,500,000 log out 34,500,000 sign out 19,400,000 log off 5,350,000
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