Jehovah is yet another name for God. The name refers to the God of the Bible. It's supposedly ineffable or inexpressible and Jews believe it's wrong to say it.
Really, God doesn't need a name if he/she/it exists.  The Jehovah's Witnesses insist that God needs a name and that name is Jehovah.
- ↑ The God of the Old Testament is more like he or it because he/it isn't caring, see Examples of God personally killing people to find out why. As to the God of the New Testament, that God is uncaring as Hell shows clearly and also the Book of Revelations shows it.