User blog comment:Takeshi kun21/What is your Name?: Guide to Naming Your RWBY OC/@comment-28735521-20160613032242/@comment-8182065-20160623085336

This falls under that shortening bullet point, I talked about. Unless you can back up with some kind of evidence that Cedan is an actual term used for a shortened version of Celedon or Cedar, it cannot be used as a name. Oddly I myself was thinking of the type of car "Sedan" and that's also pretty much covered within the same bullet point.