~4chan = 4 channel, a spin off of the Japanese 2chan (2 channel).
~blah-blah-chan (pronounced 'chon') = A term of endearment to be added onto someones name in Japan. If your name is bob, you are bob-chan (if I were to be hitting on you).
The two have nothing to do with one another, other than the fact that you can find chans on 4chan and 2chan... Unfortunately.
In other words, it's just some weeaboo shit. Kawaii kawaii neko desu!!! >:3