If God's name is Jehovah then how come nobody calls him that?

I think God and Jesus must the main names to call him people might think. I guess some people are use to calling him those two names than they are with calling him by the other names. I call him God, Jesus, Christ, AND Jehovah.

Jehovah is a transliteration and romanized name for the true Hebrew name of God the Father. As the third commandment stipulates not to take the name of God in vain...the Jews have decided NOT to pronounce God's name for fear of taking the name in vain. However since that time, the real pronunciation has been lost...because another romanized way to say the name is Yahweh. However in the new testament God has given a name above all else by which we can be saved and that is the name of the resurrected Son of God ..Yeshua or Jesus.