I grew up as a native English speaker in an English country, and had to look up what gimp means. Should the name be changed? Yes. On the other hand, I have never encountered the word outside of the context of the image editing program. That is unusual, even for an offensive term. It leaves me with the feeling that someone dug up an obscure piece of slang in order to paint the project in a negative light. (I've been using open source for long enough to know that painting open source in a negative light was a thing. For example: it used to be common to paint supporters of open source as Communist, which is treasonous in some circles.)