Marketing note: I'm pretty sure it's regional, but in the very densely populated place I grew up, lungy was a synonym for loogie, which if you've never heard the term, is phlegm mixed with saliva forcibly spit at someone or something. Unfortunately, I just viscerally find that name pretty repulsive through some deep-seated associations that would be pretty stubborn to rewire and that would probably work against the app's intended function. I'm not sure how wide of a region that's true for, but like I said, it was a very densely populated part of the US.
This isn't a criticism, it's just that I'd want to know that if it was my app.
Good luck! You've got a great mission and I'm sure you've already made a big difference in people's lives. Having worked in branding and identity, I think you'd probably have to rename really soon for it to be feasible, and depending on the size of your user-base it might be too late, but it might also not even be a problem to begin with.
Make sure you get recommendations from someone you trust for some experts to consult on the process. You could surely just consult with one for a short amount of time just to get a superficial sense for whether or not its reasonable, and if it's not, how to mitigate any concerns if it even is a problem at all. (Sometimes people not knowing how to pronounce the name right, for example, can actually create conversation about your product, and if the product is high quality, that's not a bad thing!) Marketing consultants always seem like a waste of money, but for consulting on something as important as a name change, you could have an exponential ROI. Like if you were concerned about it and they said "this affects a tiny fraction of the potential users-- it's not even worth doing a survey" then even the peace of mind is worthwhile.
Marketing note: I'm pretty sure it's regional, but in the very densely populated place I grew up, lungy was a synonym for loogie, which if you've never heard the term, is phlegm mixed with saliva forcibly spit at someone or something. Unfortunately, I just viscerally find that name pretty repulsive through some deep-seated associations that would be pretty stubborn to rewire and that would probably work against the app's intended function. I'm not sure how wide of a region that's true for, but like I said, it was a very densely populated part of the US.
This isn't a criticism, it's just that I'd want to know that if it was my app.