Month names collection / metastudy

[eggyk]

Okay, interesting. The alpbuch 1 (1641-1732) actually has 37 instances of aberil(len) as well, so quite a bit more common further back. 

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In fact, aberil seems to be the 2nd most common, behind aberel! My crtl+f gives me: 

56 aberel, 37 aberil, 18 abrel, 4 april, 3 abril, 2 aprel, 1 aperel

If such types of ledgers exist further back into the 16th century, it could be a really worthwhile avenue to search.