> his piece of software (...) will never do this unless it changes its name.
Why?
Honestly, why?
As a non-native English speaker (like the vast majority of people in this planet), the word "gimp" to me means "the free software image processing program". If I search google, duckduckgo, bing, whatever, the entire first page of results refers to that very program. Digging deeper, I start to find some references to the Pulp Fiction movie, where a minor character is named like that. I remember that character, but in my language it was called by a different name. Is that all?
Is there any other meaning to this word? If so, it must be so obscure as to be completely irrelevant.
Please, take into account that most English speakers are not native speakers, and many words will have a different meaning to us. English as a lingua franca may be comfortable to native speakers, but it also means that it's no longer yours.
The name of the program does not seem to be a serious issue for its adoption. Now, if you want to talk about its user interface... I don't think it does, either (but I may be open to discussion). I have taught my kids to do simple image processing tasks in gimp: copy-pasting parts of an image into another, removing some stuff, blurring, simple layer operations, etc. Anyhow, they got it in a few minutes. Important to say: they are not at all tech-savvy (to my dismay! but this is another story). If they use adobe or krita they will surely find it slightly confusing at the beginning, but no big deal either. Just like a regular person moving from photoshop to gimp.