Abraham, the Friend of God

Why are there not more people in the Bible that are called God’s friends?

Author photo. Gillespies Beach, South Island, NZ

Several times in the Bible, Abraham is called the friend of God. God, Himself says,

“…Abraham, My friend.” (Isaiah 41:8, NRSV)

I can’t find where anyone else, in the Old Testament at least, is called the friend of God. I don’t wish to infer…