Simple way to rename GRUB2 entries

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http://askubuntu.com – I have many different Ubuntu versions installed on my HD. I'd like to rename some of their entries in GRUB2 boot menu. I have tried two approaches. 1) Like mentioned in http://ubuntuforums.org/showthread.php?t=1347756 - This is not working, I have 9 different lines with SDA11 sections visible in my 30_os-prober file. Am I supposed to modify all of them while in real boot menu only one entry for this partition is visible after sudo update-grub? 2) I have also tried Grub Customizer application, but it just overpopulates my boot menu with duplicate entries. Instead of doing it hard way by modi (HowTos)