.Dank said:
Their twitter handle is @ lunaticjoker . Asanagi it's at least not their real name. I think this case is different.
We avoid "real names" when the artist himself uses nicknames. In this case both his twitter and pixiv use 月神るな as screen name, which is tsukigami runa, which I don't even think is his real IRL name. I want to point out that "Tsukigami" means moon goddess, and luna is latin for the moon.
Also you can't know if a doujin circle will ever expand - it wouldn't be the first time that a single artist circle gets new members, so using doujinshi names as artist names is discouraged because of that. The moment a new artist joins the circle we start getting tons of mistags.