Folder name under EFI partition

Hi everyone,

My problem is, actually have installed three OSs in my system (Zorin, Windows and Mac), thats why I m using clover bootloader, in clover bootloader screen Zorin appears as Ubuntu. After some research I found that there is a folder in EFI partition named ubuntu, i tried renaming it, after rename it is showing correctly in bootloader screen but zorin is not booting up on pressing enter on it.
I have icon too which shows correctly when renaming the folder but, it does not boot until i rename back to ubuntu, somebody please help.

I Want something like this.