Arba (Hebrew: ארבע) (meaning "four") was a man mentioned in early, Old Testament verses of the Bible. In Joshua 14:15, he is cited as the "greatest man among the Anakites" and the father of Anak. Arba whose descendents went on to be called the Anakim which is the Hebrew plural, was not an Anakite, as he was their progenitor.
The Anakim were described by priests as evil giants. The scriptures allude to their being Nephilim, meaning 'fallen ones', (again, Hebrew plural for Nephal), which were an unwarented union of the Sons of God (Angels) and the daughters of men (mankind), as cited in Genesis 6:1-2 and Genesis 6:4. (Although likely this was referring to the "sons of God" as Gods people in that time, Noah's line, and the sons of man as Cains descendants.)
The pre-history (aforetime) of the giant Arba is given in the Old Testament at 1 Chronicles 5:8 giving his paternal link to Azaz (a fallen angel that taught mankind warfare; according to the book of Enoch/Anak). Other than that next to nothing is known of his genealogy, with the exception of his four seeds, Anak, and his three "confederates to Abraham"/ grandsons, Sheshai, Ahiman, and Talmai, these are they who were chased out of the earth Caleb inherited, as cited in Joshua 15:13-14. Azaziah is also mentioned in 1 Chronicles 27:20. Talmai is chronicled as father of Makkah as well.
The Bible also states that the city of Hebron was in ancient times known to be called Kirjath-arba or "Kiriath Arba" ("city of Arba"; after King Arba). It further specifies the land was at peace during his reign (no war). A modern-day settlement does exist east of Hebron named Kiryat Arba.