I think it is everywhere in the english language world. It might not be in common usage but most adults would know the meaning.
Butt is such an innocuous word for arse it is used by preschoolers and cartoons. It isn't offensive to anyone and clearly it no more means arse in this term than it does when referring to the end of a cigarette or gun or hitting someone with your head.
I once had a client see a server monitoring package refer to daemons and I thought I was going to be the victim of a satanic panic but I quickly pointed out how the spelling differed from the usual biblical version and that a bunch of hippies in california in the 60s were into mythology and the name stuck. People are weird.
In non English-native countries, people don't know this word.
So it just sounds like "scuttle butt" and I don't want to recommend something with "butt" in the name to people.. which is a shame because it looks like a nice project.
When I search for gimp on ddg, the whole front page is filled with information about the GNU Image Manipulation Program. You can try for yourself here: https://duckduckgo.com/?q=GIMP&t=fpas&ia=about
If anything, if people actually cared about the disabled they should rejoice that this word is getting a new meaning. I for one didn't know the original meaning of that word until someone line you told me.
Do you live in an English environment? I think words like butt can sound worse for those of us who don't, since we don't use it colloquially (we use the native equivalent), only in more "forceful" cases. Frankly the first that comes to my mind hearing that word is "what what".
Still, I like the name and would be sad if they changed it!
English also has the word "but" with only one t. So actual English speakers aren't automatically triggered when they hear the sound of "b-u-t" together.
"Scuttlebutt" sounds like a hokey old timey word and it has only one definition.
As an English speaker, it's also miles better than "toot"(Mastodon) which has multiple definitions and the most common is "to fart".
I live in a weird mix of English and French (Montreal) :)
It's just surprising to me since butt always was less formal than "posterior" and less rude than what we'd more frankly call an "ass".
I definitely want to acknowledge that I know not all environments are similar to mine :)
I'm just surprised to hear there are contexts where someone might find the phrase "I've fallen on my butt" to be more rude than if any other body part was mentioned. I would have assumed the problem is less the word choice and the fact that people are being rather prude about bodies and their function, much like grade schoolers are like to be.
Considering that it made you do a double-take, and convinced me to click on it, I think it's a perfect name for a project.
In a similar vein, there's a CPU architecture called "brainfuck", oft-stylized as "brainfck". It's a lot* more memorable than something like MAOIIA or something.
The only reason I can think of to justify a name change is that both SSB and scuttlebutt are terms used in sailing. Initially I thought it was a single side band radio based chat room system for sailors.