The name God gave
At the burning bush, Moses asked God the question everyone wants to ask:
"If they shall say to me: What is his name? What shall I say to them? God said to Moses: I AM WHO AM. He said: Thus shalt thou say to the children of Israel: HE WHO IS, hath sent me to you."
Exodus 3:13 to 14
In Hebrew, the name God gives is four letters: Yod, He, Vav, He. YHWH.
The name no one says
Jews have long treated YHWH as too holy to say out loud. When they read it, they say Adonai, "Lord," instead. That's why most English Bibles, the Douay-Rheims included, print it as "the Lord."
In the Temple, only the high priest spoke it, on the Day of Atonement. After the Temple fell in 70 AD, even that stopped.
Now sound it out
Hebrew was written without vowels. So try sounding the four letters on their own, with no vowels added:
They are some of the softest sounds in the language, made with air, not with the tongue or the lips. What comes out isn't really a word at all.
It's a breath. In, and out. In, and out.
The first breath
Now read how God made the first man:
"And the Lord God formed man of the slime of the earth: and breathed into his face the breath of life, and man became a living soul."
Genesis 2:7
God breathed into Adam. The first thing Adam ever did was breathe. Job says the same of every person:
"The spirit of God made me, and the breath of the Almighty gave me life."
Job 33:4
Everyone is saying it
You breathe around 20,000 times a day. You don't decide to. You can't stop.
Every person who has ever lived has done it. Every baby. Every king. Every person who has never heard of God, and every person who says he doesn't exist. The first thing you did when you were born was breathe in. The last thing you will ever do is breathe out.
Every breath in between, the name.
The last line of the Psalms
The book of Psalms is the Bible's songbook. Its very last line is this:
"Let every spirit praise the Lord. Alleluia."
Psalm 150:5 (150:6 in most Bibles)
"Spirit" here is the Hebrew word for breath. And "Alleluia" means "praise Yah," the short form of God's name. The last line of the Psalms is: let everything that breathes praise the one whose name is breath.
Why this is a big deal
God didn't hide his name where only scholars could find it. He put it in the one thing every human being does without thinking, from the first second of life to the last.
You have been saying the name of God since the day you were born. You are saying it as you read this.