Reference: Gerzites
Fausets
Gizrites, or Gerizzites. A Bedouin tribe once dwelling in central Palestine, from whom mount Gerizim took its name, as another mount was named from the Amalekites when dwelling in ancient times in Ephraim (Jg 12:15). Afterward driven to the southern border of Palestine, where with the Geshurites and Amalekites they were found by David in Saul's days (1Sa 27:8), rich in "sheep, oxen, asses, camels, and apparel." Read "Gerizzites."
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Smith
Ger'zites
(dwellers in the desert), The, a tribe who with the Geshurites and the Amalekites occupied the land between the south of Palestine and Egypt in the time of Saul.
In the name of Mount Gerizim we have the only remaining trace of the presence of this old tribe of Bedouins in central Palestine.