Jamieson, Fausset and Brown on Numbers 13:33

33. there we saw the giants, the sons of Anak--The name is derived from the son of Arba, a great man among the Arabians (Jos 15:14), who probably obtained his appellation from wearing a splendid collar or chain round his neck, as the word imports. The epithet "giant" evidently refers here to stature. (See on Ge 6:4). And it is probable the Anakims were a distinguished family, or perhaps a select body of warriors, chosen for their extraordinary size.

we were in our own sight as grasshoppers--a strong Orientalism, by which the treacherous spies gave an exaggerated report of the physical strength of the people of Canaan.