How can I change the volume name of a FAT32 filesystem?

How can I change the volume name of a FAT32 filesystem?  I know I can set the volume name when I format the partition with the -n option of mkfs.vfat.  But how to just change the name without formatting? I especially want to be able to use lower and uppercase letters.  In worst case, I can use a Windows tool, but Windows by default transforms all letters to uppercase (but works fine with lowercase letters in volumes created with mkfs.vfat).