There are way more than that, https://encyclopediadramatica.se/List_of_*chan_boards
2chan (Futaba Channel) was the original, 4chan was then made by moot as an english language copy of it, later, 1chan was made by thatdog (friend of moot) after 4chan's /r/ (Trains) board became the board used for messing around with the site's code. Most of the others started out as "we're just like 4chan, but with less rules", or "we're just like chan, but in *other language"
[1chan]