To be precise, if you want to get an accurate answer to the question why you were named Gaiyan, you should ask the person who named it.
If you ask here, I will help you guess.
Assume that Gaiyan is a person’s name.
First, I want to make myself more and more beautiful through improvement. Yan means gorgeous.
The second reason is that I may have listened to the nonsense of a certain master, saying that the name is not good or bad, and there is something missing, so I changed the name. Originally it might have been called Yanyan, but it was changed to Gaiyan.
The third one is you. I remembered that my name was Gaiyan, but I was not sure, and I was afraid that something was missing, so I came here to ask.
If you want to call it this name, I’ll tell you, there’s nothing wrong with calling it your own.