I really dont get it.
On my system (CentOs) GIMP is only one time to read. And this is on the splash screen, which is easy to customize.
No one who just uses it would see GIMP anywhere there or know of it.
Everywhere else stands Gnu Image Manipulation Program.
So if it would be really the only problem in official institutions (or marketing in general) with the name than the admin just could change the splashscreen and refere to it as Gnu Image Manipulation Program instead of GIMP, which is only the acronym anyway.
And now that I know that someone from Oracle is forking GIMP, i become suspicious of the real motivation for that fork.