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.
About the Jones surname. Jones is a popular surname of English origins. It was first documented in 1279 in Huntingdonshire, England. Its English usage comes from the term son of John in a similar manner to the scandanavian surname Johnson (son of John). In early Wales though, the son of John was identified as John ap Evan (John son of Evan).