John 1:1 begins the same way that Genesis 1:1 does. In the Genesis passage, God speaks the world into existence. This tie emphasizes that The Word was present in creation. A Jewish reader would recall the plural collective name of Elohim used in that passage along with the "Let us make man in our image..."
God the Son is co-eternal with the Father and the Spirit, so the name Jesus/Yeshua (The Lord saves) was given to Him when He became a man and entered into His own creation.
Jesus is the One who reveals/discloses/unveils God. In that sense, He is God's message/word/declaration. "No one has ever seen God (the Father), but the Monogenes/only begotten/one of a kind Son of God has declared Him."
So, "The Word" ties back to Genesis 1 to indicate Jesus' presence in creation and also describes His role in revealing God to mankind.