Month names collection / metastudy

[eggyk]

Is this a good lead to keep searching?

Absolutely, luxembourg manuscripts are a good lead. However, the trick is being able to find month names written down in text without scanning every page of every manuscript (each manuscript can be 100s of pages, and there are 100s of manuscripts).  That's why most of the entries are from works marked as calendars in some way. 

If you want to go through each manuscript anyway, the next best thing is searching through the thumbnails for the pages and looking for "calendar-like" pages (often with KL in the top left), pages with paragraph breaks and subtitles (often in red), or pages with tables and astronomical diagrams. Walls of text are generally better to avoid, other than maybe the first/last page of a chapter to check the topic. 

   
(left two pages are paragraphs about each month)
   
(you can see KL + calendar layout)

But even that tends to take a while. If you can narrow down the search somehow (date, language, topic) you are way more likely to find something.