Month names collection / metastudy

[Koen G]

The thing with the introduction of the accent circonflex is something to keep in mind, but I also wouldn't use it as an absolute guideline. All in all our knowledge about this is pretty shaky at the moment. 

Octembre is a certainty and a good anchor point. If it is actually true that it disappeared after ca. 1500, then we must also take this into account.

I agree that the script is not one would use in a book of hours, and hence the actual vocabulary might have been less standardized as well. This should be less of a problem before the Age of Grammarians though.