1:1
Simon was one of the most common Jewish names in the first century. Jesus gave him the name Peter (Matthew 16:17–18). Many people in the Greco-Roman world would use both their given name in their native language and also a Greek name. They did this because Greek was the common language used for trade and communication (see study note on Acts 7:58).
a servant … of Jesus Christ: In the Old Testament, important leaders of God’s people are called servants of the Lord (Joshua 14:7; 24:29; 2 Kings 10:10). This title emphasizes Peter’s submission to Christ and also suggests that he had an important role in God’s plan.
ours: This probably refers to Jewish Christians. The recipients of this letter were mostly non-Jewish (Gentile) Christians. In the new covenant, non-Jewish and Jewish Christians share the same precious faith and are equal as God's people (see Galatians 3:26–29).
This is one of the few places in the New Testament where Jesus Christ is called God (see also John 1:1; 20:28; Romans 9:5; Titus 2:13; Hebrews 1:8; 1 John 5:20).