when it comes to renaming of groups, a facebook group with 15,000 members or more cannot be renamed.
I myself had a group of about 16k and I needed to change the name but I couldn't, I tried every possible means, but to no avail. I even search on Google for help but still couldn't get any tangible information.
Upon all my trials, I didn't use facebook group Android app. I didn't think it could do the job. But I later tried it and it changed my group name.
So you can also try it to see if it will work for you.
Tell us if it worked for you by Using the comment section.
