Month names collection / metastudy

[nablator]

The question would be if they'd also replace a consonant "i" by "y". It feels like you'd only do it when "i" is a vowel, as in your "ydolorum" example.

I checked in the transcription (not "modernized" to classical Latin) of the You are not allowed to view links. Register or Login to view.: the river Jordan is fluuius iordanis, Jesse (father of king David) is yesse, but Jesus is i(h)esu(s) and Jerusalem is ierusalem. Go figure...

Typical medieval Latin spellings. I've seen iherusalem elsewhere. They didn't like "ie", preferred "ihe" and "ye". They also didn't like "mn" so they wrote "mpn" instead: sompnus, dampnatus, ...

Many seemingly random y/i substitutions:
tytulus
hystoriis
ydola egipti
ymaginem
moyses (Moses)
symonem syrenensem (Simon of Cyrene)
...