month names

[-JKP-]

No, definitely in the Alemanic language area.
Abril, May, Jony, Jolei, Augst, is typically allemanic.
The endings bri, bre, occur in the southern Bavarian language area. South of the Alps.
South Tyrol, Bavarian and Ladin.

You will have to show medieval examples. It's not enough to say it.

I have collected about 500 examples from all over Europe. Most of them are Latin, but some of them are in the vernacular.

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I'll tell you the house number of the Voynich author.

Isn't it generally accepted that the month names were added later? I thought the handwriting showed it had to be added the next century?

The handwriting is 15th century or maybe very early 16th century.

The way they are scribbled on top of the drawings makes it look like they were added by someone who didn't have a vested interest in creating the manuscript. For the most part (there are a few exceptions), the scribes tried not to write on top of the drawings.