OK, finally I've got the solution.
For the mentioned example above do the following steps:
1. On webserver's filesystem create an empty folder called
myCustomName
2. Open the Apache's
.htaccess file and add the following content:
RewriteEngineOn
RewriteRule ^myCustomName https://myDokuWikiURL
That's it. Now people can get directly to my specific DokuWiki page by just entering
myDomain.com/myCustomName without having a complex URL.
Edit: Please note that you have to put the according
.htaccess-file into the root folder of the according website where the index site is located at. As I am using a Synology host for my web stuff and I have multiple websites hosted on it I did mention that I can set up a
.htaccess-file for every single web folder.