Text and context

[cvetkakocj@rogers.com]

I cannot say whether this spelling was adopted from Slavic.

The 'y' meant 'and' in Slavic. It originates in the Old Church Slavonic and was widely used in Slovenian dialects where OCS liturgy was practices. That means in the south-Eastern Carniola. In the Stična Codex from 1442, written by a Czeck monk, the word INU (in various variations of spelling - inu, inv, innu).That was the only 2-page document written in Slovenian and in Latin letters in the 15th century. The next text written in Slovenian and Latin letters were the books written written by the Protestant writers who studied in Tubingen and were later, after being exiled, living in Tubingen. Under the German influence, the used the word INO or INU for 'und'. The books written by the Slovenian writers. like philosopher A. Vremec,  who lived in the regions where OCS liturgy was used, use the word 'i' consistently. Eventually, the word INU was used for Slovenian literary language, and has later evolved into 'in'. In the dialectal speech of White Carniola, the word 'i' is still used. 
I noticed that in the VM, Y is used extensively for 'and'. Since VM was written before the letter 'j' became in use, the 9-like Y was used at the beginning and at the end of the words. This was consistent with change of pronunciation of the names of the saints in medieval Calendars. For example: Gregorius, spelled with Latin abrevation Gregory, Became pronounced as Gregory or Gregorij (in Slavic).