The English word
"angel" comes from the ancient Greek word
"ἄγγελος" ≈ "messenger, one that announces".
In the Biblical context, the meaning is that of a messenger from God and comes from the Hebrew word
"מלאך" (mal-ak) ≈ "angel" and is the root word for the prophet name "
Malachi".
Despite the song "
Hark the herald angels sing" the Bible records only one angel not singing at the birth of Jesus.
Other ancient cultures such as in Egypt, Babylon, Greece, etc., had supernatural beings that were messengers that brought news - good or bad. This idea appears to have been passed down from Adam, eventually to Noah, eventually to peoples and cultures dispersed from the Ark and the Tower of Babel, etc.