Why had my profile name changed and how do I change it back

If you mean your profile name here, I have no guess as to why it got changed, but it's not something any of we users can change ourselves. I'll flag your post to the attention of the Community Hosts and they will probably be in touch.

Regards.

madirmur59 wrote:

Some time ago my profile name changed, and I'm not able to edit it. I thought i got hacked.

You were not hacked. The only people who can change your username here are the Hosts. They generally do it for one of two reasons (that I know of). 1) You made a request to have it changed. The Hosts grant those requests on a limited basis. 2) Your username was determined to be in violation of the terms of use.

I suppose it's theoretically possible that someone else logged in with your creditials and requested a username change but that sounds a bit out there.

madirmur59 wrote:

So the way it works is we set a profile name when we sign up for a profile using our Apple ID, and once the profile name is created, there is no changing it directly at the user's control? Is that correct?

Correct.

If you refer to the Urban Dictionary, you will find that, in American English, the first five letters of your old username may be considered a pejorative term for an ethnic group. That may be the reason.