In the Arabic language there are at least ten names for water according to its salinity and potability starting from “Ujaj”, which is the bitterest and most saline water, and ending with “zulal”, the clear, sweet and cool water. Water has always been regarded as a precious resource in the Arab world. Many Arabic feminine names have a water-related meaning:

Dima = rainy cloud;

Riham = fine rain;

Muzna and Rabab = white cloud;

Nahla = drink of water;

Rayya = sated with water;

Kawthar = sweet water;

Hutoon = pouring rain

Source: IRC news
http://www.worldwaterday.org/page/449