Where did Joey's character Ken Adams come from? I would like to introduce myself, my name is Ken Adams

I think it was just a random name the writers came up with. Ken isn't that common, but Kenneth has been in the top two hundred baby names in the US for over twelve years and it's more popular the further back you go. There would probably been quite a lot of Kens in the 1990's. The surname Adams is also very popular - it's the 39th most common name in America, I believe.