God's name

If you believe there is god and you believe in the bible then the name is Jehova (it sounds better in Hebrew actually).

If you believe there is god but you don't believe in the bible then the name is probably Budha or Allah or many other options.

If you don't believe in god, then why name it?

The name of God, as seen in the Hebrew Bible, is Jehova. This is the name that appears over and over again in Hebrew, and we change that word to something like "My Lord", because you are obviously not allowed to speak His name in vain. 

Read more here.

I don't know, but I can tell you his wife's name.

Threre are four names of God in Old Testsment and one in New Testament:

Old testament:

1) YHWV (no vowels according to Hebrew tradition, so nobody knows how to pronounce this word. Tradition to pronounce it like "Jehova" appeared in Medieval Centuries and is just a guess.)

2)Ha-shem ("Master")

3)Adonai ("Name", just substitute for #1 because it's strictly forbidden to pronounce God's name)

New Testament:

1) Allohim ("Father", Jesus appealed to God like this) BTW, Islamic "Allah" has the same root :) 

Although there is only one true God, He is called by many names in the Holy Bible. In Hebrew, God's  most common proper name is represented by the 4 consonants YOD HE WAW HE, which is usually written "Yahweh" in English. Sometimes "Jehovah" is used, which is what you get when you combine the vowels for "Adonai" (Lord) with the consonants for "Yahweh." This name is sometimes rendered "LORD" in English translations, not to be confused with "Lord" (the rendition of "Adonai") -- note the small capital letters in one and not the other. Trust me, God knows who you are talking to when you pray, so please don't sweat this one too much.

(Source: the alt.bible FAQ, compiled by Michael Paul Johnson)