Because you are his sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba, Father.” – Galatians 4:6

I met a six-year-old recently who let me play doubles on his ping pong team. He was a confident young lad.
At one point, I asked someone who knew who this boy’s parents were. She let me know his parent’s names. They little boy came up about that time and protested!
“My Mom and Dad’s name is Mom & Dad!” He said with confidence.
The Holy Spirit within us cries out Abba Father; Dad! That’s my Father’s name!
There’s a lot I don’t understand about the evolution of languages, yet it is fascinating how language holds in its DNA the history of nations.

After a head-spinning yet exciting reading into where the word “Abba” comes from, it boils down to this. It is used three times in the New Testament as a Greek word (Mark 14:36, Romans 8:15 and Galatians 4:6), followed by the term “Father,” a term of endearment for God Himself.
The first and only use of the word “Abba” by Jesus in the Garden of Gethsemane.
The next time it is used is in the book of Galatians, dated sometime around A.D 40 – A.D. 55. I imagine the Holy Spirit conversing with my spirit, which is Christ my lawyer at work on my behalf speaking to God Himself not only reverently, but as a child reaching out for Father God’s affections and absolution when needed.

Father is protection, love, direction, wisdom, comfort, provision and so much more.
The final use of the word is in Romans, dated later than Galatians, yet trekking along the same path. As Christians, we are under God’s parenthood by adoption (interpretation mine) where we can call him Abba Father anytime.
He isn’t just Yahweh, but Abba, our Daddy God!
Amazing!