When However is being used as a transitional phrase, preceding it with a comma is a mistake. It is called a run-on sentence. On occasion, it might be appropriate to precede however with a semicolon. I don't like cake; however, I love scones.
Johnson is a name of ancient Norman origin. It arrived in England with the Norman Conquest of 1066. Johnson is a name that comes from the given name John and the name literally means son of John.. The given name John is derived from the Hebrew name Johanan, which means Jehovah has favored.
This interesting surname is as patronymic from the male Hebrew given name David, from Dodaveha meaning Beloved of Jehovah. This name was borne by the greatest of the early Kings of Israel which led to its popularity first among the Jews and later among Christians throughout Europe in the Middle Ages.