But the angel said to him: "Do not be afraid, Zechariah; your prayer has been heard. Your wife Elizabeth will bear you a son, and you are to call him John.
Noun - Accusative Masculine Singular
Strong's 2491: Of Hebrew origin; Joannes, the name of four Israelites.
Thayer's Greek Lexicon
to whom Jehovah is gracious (...
I've always thought it interesting that Jesus is the 'son of David' and David's best friend is Jonathan. And wondered if that has to do with John's name.
Then of course David was next king after Saul and Saul /Paul is shortly after Jesus.
The origin of Hebrew name יוֹחָנָן (Jochanan) is explained as "Grace of Yahwe".
This would well fit the story before, as God showed grace to Zacharias (Zekhriah).
The addressee of God speaking in the cited text is anonymous; it is written in the beginning of the Second book of Isajah (40:3-5) which is rather a Psalm book than a Prophet's book.
The answer is supplied by John 1:28 -
28 All this happened at Bethany beyond the Jordan, where John was
The problem is now, "Where is the Bethany of V28?" This is a much debated point since the time of the early church fathers. The Jamieson-Fausset-Brown Bible Commentary offers this summary of the debate: