PS: With the file manager Total Commander you have a multi-rename tool which is very helpful here.

For the easiest high quality naming, just copy and paste the main text into the name every time...

If you have selected your concerned files then you write your main text once and with one klick you rename them all. Now you could select a few from them and do it the same way with a second level main text which would be appended to the existing file name, and so on.