Elamite 10th c. AD ?!?

[Rick Mc Callister]

After rooting around I found the article "Elamite" in
Funk & Wagnalls Encyclopedia
by Samuel N. Kramer
stating that Arabic sources in Khuzestan indicated
that Elamite was still spoken in the 10th c. AD

How reliable can this be?

BTW: I also found a curious article on Avars in F & W
stating that their descendents
are "Lezghians [who speak] a language similar to Arabic"!!!

Can anyone explain that?

Rick Mc Callister
W-1634
Mississippi University for Women
Columbus MS 39701