tungemål wrote:Thanks, Dragon.
The "e" becoming "ja" seems like a palatalization, and correct me if I'm wrong but doesn't exactly this happen in Russian? "e" pronounced as "je" and "Я" pronounced as "ja".
It's called vowel breaking in Old Norse and it's pretty regular there, happens in a bunch of environments, after consonants, at the beginning of the words, etc. Usually the term 'vowel breaking' means the changing of the vowel into a diphthong; here the sound combination is not exactly a diphthong, although some call it "rising diphthong" (a combination of "glide", like /j/ or /w/ and a vowel).
Palatalization is the process of changing of consonants before front vowels, like /k/ to /c/ or to /tʃ/ and stuff like that.
What happened in Slavic (back in its Proto-Slavic glory) is this, I believe:
https://en.wikipedia.org/wiki/History_o ... #ProthesisProthesis
During the Common Slavic period, prothetic glides were inserted before words that began with vowels, consistent with the tendency for rising sonority within a syllable. These cases merged with existing word-initial sequences of glide + vowel, and show the same outcome in the later languages. *v was inserted before rounded vowels (*u, *ū), *j before unrounded vowels (*e, ē, *i, *ī). Not all vowels show equal treatment in this respect, however. High vowels generally have prothesis without exception in all Slavic languages, as do *e, *ě and nasal *ę:
*i- > *ji- (> *jь-)
*ī- > *jī- (> *ji-)
*u- > *wu- (> *vъ-)
*ū- > *wū- (> *vy-)
*e- > *je-
*ę- > *ję-
*ē- > *jē- (> *jě- or *ja-)
The exact etymology of the Proto-Slavic "
(j)azъ" and its development from a Proto-Indo-European root lacks some details, but it seems to fall in with the last pattern in the quoted part (*ē- > *jē- (> *jě- or *ja-)). The root at the level of Proto-Balto-Slavic (before it's split into the separate Baltic and Slavic branches) was something like "
ēź-". You can see in the link that the Baltic languages (modern and older varieties) have forms like "es" and "as" (and "eš"/"aš").
So, not exactly the same process, I would say.