No, not unusual. I had the same reaction, and assumed it's probably partly a deliberate joke to have such a placeholder name (or alternatively it's actually so that the Scientology connotation didn't occur to folks at SIAI).

I btw commented on this a couple of days ago in a comment to the SIAI blog, and note now that comments there seem to take a rather long time to be moderated for spam, as apparently no comments have appeared for many months. (Ok, sorry for the joke. More likely you've forgotten about the blog comments or something, than it really being about the spam moderation that commenters are told might take some time when they leave a comment.)