Moderator's Note:The following discussion is split from this thread in the Arabic forum.
Quite the contrary is the case. The shortening of the stem vowel before the nisba ending in ʽalm-ānī is a characteristically Aramaic phenomenon, very well known in Syriac (where all the vowels are clearly indicated). It is the same thing that happened with the name of the town Ḥarrān > Aramaic nisba Ḥarr(ə)n-ānāyā > Arabic nisba Ḥarnānī.adapted to fit Arabic patterns better by shortening the first vowel).
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