Why do people spell Gaga like this GaGa?

Because the 皇后乐队 song she called herself after is spelled Radio Ga Ga.

i dunno but it is annoying

I know one reason is because if 你 spell it like this Gaga it is almost like saying Gag with the letter a at the end like Gag a. GaGa is probably better. GaGa is 2 of the same word squished together if it was one word then it could be Gaga but, whatever. I don't care either way. I am use to spelling it Gaga and seeing it that way. It still means the same thing either way.