From Proto-Berber *săḍis. Closely related to Central Atlas Tamazight ⵙⴹⵉⵙ (sḍis), Kabyle sḍis, Tashelhit sḍes, Tayert səḍīs, Zenaga šuḏ̣iš and more distantly to Proto-Semitic *šidṯ- and Egyptian sjsw.
săḍis ?