John Gill Commentary 2 Samuel 23:33

"Shammah the Hararite, Ahiam the son of Sharar the Ararite," — 2 Samuel 23:33 (ASV)

Shammah the Hararite
From the mountainous country, as the Targum; the Arabic and Syriac versions say, from the mount of Olives:

Ahiam the son of Sharar the Hararite :
from the high mountain, as the Targum; in (1 Chronicles 11:35) , he is called the son of Sacar.