David: Israel's second king, son of Jesse, and founder of the royal line God promised would endure forever.
David is the most-named human being in the Hebrew Bible, appearing over a thousand times. Almost every occurrence points to one person: the shepherd of Bethlehem who killed Goliath, served in Saul's court, and became the second king of Israel, uniting the tribes and making Jerusalem his capital. The books of Samuel, Kings, and Chronicles tell his story, and roughly half the Psalms are headed with his name.
The name itself is usually connected to a Hebrew word for "beloved" or "darling," so the name reads roughly as "beloved one." That fits the man the text calls "a man after God's own heart," though the name is a label for the person, not a running comment on his character in every verse.
David's lasting weight comes from the promise God made him: that his throne and his house would stand forever. From then on the name carries the whole royal dynasty with it. The prophets can speak of a future "David" long after the king was dead, meaning the promised ruler from his line, and the New Testament picks this up when it calls Jesus the "son of David," using the Greek form of the same name (Δαυίδ).