Jesus and jehovah are the same thing. Really it depends on what you believe.
You see Jesus is Gods son that he sent to die for us. An easier way to explain this would be that Jesus is the fleshly representation of God.
I, being a Christian, believe that Jesus was sent to die for our sins so that we would have the chance to go to heaven. Now I know this is confusing, but they are the same person. Jesus is just as much God as God is himself.
This answer of course is in the perspective of a Christian and is not what everyone believes. To me this is fact to others it may be fiction, but if you want to know more I would be more than happy to talk to you in depth about it. It's up to you though. Hope this helps. C ;
Jehovah is not an the original manuscripts where we get our modern Bible from God's name is YHVH, YAHVEH, meaning IAM THAT IAM, JESUS being interpreted is GOD SAVIOR Jesus always call God Father and God is in the spirit Jesus is God in the flesh where God and Jesus are the Holy Spirit is also Jesus is the way the truth and the life no one comes to the Father except by him read the Bible that will scare the hell out of you...
Why would God, whom you call Jehovah, an English rendition on the Tetragrammaton, call Jesus by any name? The heavenly trial of Jesus was over with 2,000 years ago, and Jesus was found sinful and sent for eternity to hell, where his sentence is to be fully immersed in boiling excrement, as is befitting his sins. God doesn't just converse with those condemned in hell, so I don't think He calls him by any name. If God speaks of Jesus and refers to him, God would either use his name, Yeshu'a bar Yossef, say "that man", as is sometimes customary, or say Yeshu, which is an acronym befitting Jesus, as it so closely resembles his given name.
As for your other question, we do not really know. Most agree that Joseph was not Jesus' biological father. Some suggest it was the Roman Legionnaire Panthera, although there is a debate whether Mary was having an adulterous affair with him, or was raped. There's some (scant I must admit) evidence for either. At any case, whether it was Panthera, Joseph, or another man, the important thing is that unless Mary was raped, she was committing adultery. Either way Jesus therefore was a momzer.