The name Adoniyah is a theophoric compound: adon (lord) + Yah (Yahweh), meaning "my Lord is Yahweh." Most notably the name of David's fourth son who attempted to seize the throne before his father's death.
Adonijah's story teaches that presumption cannot override divine appointment. Though natural successor by birth order, he had not been chosen by God. His declaration "I will be king" (1 Kings 1:5) was overturned by God's covenantal promise that Solomon would reign. His fate warns against seizing what God has not given.