Patronymically from Arow'er; an Aroerite or inhabitant of Aroer -- Aroerite.
see HEBREW Arow'er
H6200. Aroeri
עֲרֹעֵרִי adjective, of a people of foregoing; ׳הָע 1 Chronicles 11:44.
ערשׂ (√ of following; compare Arabic booth, shed, throne, grape-trellis, woman's (camel-) saddle; Ethiopic booth (? also bed); Assyrian iršu, bed, couch; Late Hebrew עֲרִיסָה cradle, עַרְסָא ᵑ7, Syriac , Palmyrene ערשא; the common idea is apparently that of a wooden structure, frame, compare NöZMG xi (1886), 737).