Guttural R
Many Jewish immigrants to Israel spoke a variety of Arabic in their countries of origin and pronounced the Hebrew rhotic as an alveolar tap , similar to Arabic '. Gradually, many of them began pronouncing their Hebrew rhotic as a voiced uvular fricative , a sound similar or (depending on the Arabic dialect) identical to Arabic '. However, in modern Sephardic and Mizrahi poetry and folk music an alveolar rhotic continues to be used.
Arab (etymology)
In the Bible, the word "ʿarav" is closely associated with the word "ʿerev" meaning a "mix of people" which has identical spelling in unvowelled text. Jeremiah 25:24 parallels "kings of "ʿarav "" with "kings of the "ʿerev" that dwell in the wilderness". The account in 1 Kings 10:15 matching 2 Chronicles 9:14 is traditionally vowellized to read "kings of the "ʿerev" ". The people in question are understood to be the early Nabateans who do indeed appear to have been a mix of different tribes. The medieval writer Ibn an-Nadim, in "Kitab al-Fihrist", derived the word "Arab" from a Syriac pun by Abraham on the same root: in his account, Abraham addresses Ishmael and calls him "uʿrub", from Syriac "ʿrob", "mingle".