Adadah
The name Adadah means “testimony of the assembly”.
Smith's Bible Dictionary 1863
(festival or boundary), one of the cities in the extreme south of Judah, named with Dimonah and Kedesh. (Joshua 15:22)
International Standard Bible Encyclopedia 1915
a-da'-da (`adh`adhah): A city in the southern part of Judah (Jos 15:22). The older copies of the Greek text have Arouel, but that is not a sufficient reason for identifying the name with the Aroer of 1Sa 30:28. Some scholars adopt the change of text, and identify the site with Ararah, about seven miles Southeast of Beer-sheba. Others identify it with Adadah, eight or nine miles Southeast of Arad.