The root origin of the word "son" is "sound". Sound as in the sounding words, sonar, sonata, song and sonic boom. Notice these two parallel, O.T. and N.T. "In the beginning" verses in Gen.1:1 and John 1:1.
And God said, Let there be.... Gen.1:1-3
God spoke (words) the world, its light, contents and life into being.
"In the beginning was the Word and the Word was with God and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not anything made that was made." John 1:1-3 (God's Word created) "The Word was with God and the Word was God."
"Through faith we understand that the worlds were framed by the word of God." Heb.11:3.
God sent an angel and told Mary that she would be the human channel through whom he would come into the world, as her son, and His Son, and as the blood sacrifice for the sins of the world, in fulfillment of the the Old Testament blood sacrifices and prophecies of a coming Messiah.
"For whom he did foreknow, he also did predestinate to be conformed to the image his Son, that he might be the among brethren. Rom.8:29.
Jesus Christ is both God and the Son of God. His two fold nature was Spiritual and Physical. As Christ (Messiah) His Spirit was God. As the flesh and blood Son of Mary and of God, he was Jesus (Savior) who came to die, as a blood sacrifice, on the cross, for our sins. He was God's extension of Himself from heaven into human presence, with human needs. He was the Son and Sound of God's Word to the world from creation through the Revelation of Jesus Christ.