Short answer. Jehovah Adhonahi or Yahweh Adonai, is a way of saying the Lord God... or the one and only God... the one who made the heavens and the earth... the God of The Bible (as understood by Jews and Christians).
Longer answer...
In the Hebrew Bible ("Old Testament") the two major names for God, that is, the all powerful creator of the heavens and earth, were Yahweh (sometimes people use the transliteration, "Jehovah") and Elohim. Some describe Yahweh as the covenant name of God. It was used by God when Moses asked how to address God.
Many Jews felt the name Yahweh was too holy to speak. Therefore when they came across the name in the Hebrew Bible, they would say "Adonai" instead. This word in normal use means "Lord" or "Master". However, in the context it essentially means God, or Yahweh.
In the Septuagint, the Greek translation of the Hebrew Bible, Adonai became the Greek word "Kurios" which also, in common conversation, means Lord or Master, but within the context (for the same reason) means God.
jehovah
* El Shaddai (Lord God Almighty) * Adonai (Lord, Master) * Yahweh (Lord, Jehovah) * Jehovah Nissi (The Lord My Banner) * Jehovah-Raah (The Lord My Shepherd) * Jehovah Rapha (The Lord That Heals) * Jehovah Shammah (The Lord Is There) * Jehovah Tsidkenu (The Lord Our Righteousness) * Jehovah Mekoddishkem (The Lord Who Sanctifies You) * Jehovah Jireh (The Lord Will Provide) * Jehovah Shalom (The Lord Is Peace) * Jehovah Sabaoth (The Lord of Hosts)
There is no "Book of Jehovah"
"Jehovah-nissi" (Exodus 17:15) can mean either "Jehovah Is My Signal Pole" (Hebrew) or "Jehovah Is My Refuge" (Greek).
Jehovah's witnesses don't have flag but they have a logo.
A Jehovah's Witness is someone who gives testimony (witnesses) about Jehovah, the God of the Bible.
Jehovah does not have a last name
As 'Jehovah' is recognized by many to be God himself then one can only assume Jehovah worships no one.
No Gino Vannelli is not a Jehovah's Witness.
Well, we Jehovah Witnesses take care of our safety. We try to stay away from people we are not too sure of, and if the person who invited the Jehovah's Witness member is not a Jehovah's Witness, we say no. However, if it is a Jehovah Witness who invited a Jehovah Witness to a sleepover, it depends.
"Jehovah est son nom" is French for "Jehovah is his name." It refers to the belief in the divine name of God as Jehovah, particularly in the context of certain religious traditions that hold this name in high regard.
"Jehovah" is the name of God. No one invented him.