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First of all, the verses you quote refer to God, not Jesus. Your confusion is somewhat understandable. Throughout the Old Testament, God is referred to repeatedly as Lord. Since He is Lord of the universe, this is entirely appropriate. But the New Testament uses the term to refer to both God and Jesus. In both cases, the word is translated from the Greek kurios, meaning one with supreme authority.

I believe that the people in the time of Jesus used the term on a more personal basis. By using this term, they were recognizing Him as one with supreme power over their lives. But Jesus realized that His Father was the one with the real power. He said as much when He was brought before Pilate.

John 19:10-Then saith Pilate unto him, Speakest thou not unto me? knowest thou not that I have power to crucify thee, and have power to release thee? John 19:11-Jesus answered, Thou couldest have no power at all against me, except it were given thee from above: therefore he that delivered me unto thee hath the greater sin.

Alpha and Omega are the first and last letters in the Greek alphabet. Greek was the preferred language of the Roman Empire at the time Jesus was alive and for many years after. Most of the New Testament was translated from Greek manuscripts. God means He is the beginning and the end, as the verse explains.

Revelations 1:8 “I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.”

Best always
Brother Ron