I have a note of possibly three Luffmans in Virginia: Daniel (3 mentions) and William (1 mention) included in my books/cds "Complete Book of Emigrants." These are available in most US genealogical libraries if you not come across them before. I suspect Daniel and William were closely related since both are listed in December 1666, the former as a transportee and the latte as the contractor in Bristol. Hope this helps,snd good luck.
Peter Coldham