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This Gospel writer, who begins his Gospel with a genealogy that ends with Joseph, uses this title for Jesus in the very first verse of the Gospel. This same title is used a number of times in the Gospels, sometimes by people appealing to Jesus for help.
What is "Son of David?"
"An account of the genealogy of Jesus the Messiah, the son of David, the son of Abraham." Matthew 1:1
"Just then a Canaanite woman from that region came out and started shouting, “Have mercy on me, Lord, Son of David; my daughter is tormented by a demon.” Mt. 15:22