Don't know if this helps!My father(Richard Earnest Jarman) told me that he was told that the Jarmans came over to England with William the Conqueror and that the name may have been Jarmaine (French). However, my father was a bit prone to "romantising" so make of it what you will! The name Harman must have had the same root as Jarman and that could have come from Hermann so the German connection does make sense! I am going to do some research on my Jarman ancestors starting with my grandfather who was a Yorkshire miner. It is not so easy to get British information online as it is with you in the States!