Cannot Change back to my old Gamertag

I've used the Gamertag "SarenyGames" for a few years now. Recently I tried to make another account for a friend, but when I tried to change that account's Gamertag, it changed my account's (SarenyGames) Gamertag to the one we wanted for the other account
(PathWatt). However, when I tried to change it back to my original name, it said that is was not allowed. After some research it turned out that the name/term Sareny has a definition that could be used in a harmful way. However, this definition was found on
a website which anyone could take a word, whether real or not, and create their own definition for it. I also believe that very few to no people actually know or use "Sareny" in this way. If this is the reason why "Sareny" or "SarenyGames" is not
allowed, I do not see this as a fair reason as there is not much credibility to this definition. Sareny is also a forename used by some, although I only use it as a Gamertag as it is similar to "serene". Since Sareny is used as a name, not allowing it would
be like not allowing the name Joseph or other names. If the inappropriate definition is not the reason I cannot use this gamertag, I would love to be informed as to why. I am fine using another name, but I am very accustomed to "SarenyGames," so I
would personally prefer to be able to change back to that name.

(EDIT): After toying around with the name change system thinking of names that impact me as much as SarenyGames did, I realized that to actually change my name again, I would have to pay. I would be fine paying if Sareny was actually allowed, and if I could
change my name back to what I wanted. However, to change it to something I'm not satisfied with would be a waste of money, and I'd rather keep the name "PathWatt" even though I do not like it as much.

:)