Sorry for the delay in responding. I think the idea that Offutt was mistaken from Moffat is interesting, but haven't really looked into it. Most sources I've seen believe the family is from England with a possible ancestor who remains unproven.
My brother participated in the Oxford group on the Family Tree DNA website. I don't know if there is some other Offutt site where I should submit his results.
What is your Offutt line? Mine goes like this:
1. Mary Kay OFFUTT (me, aka Kay Schmidt) 2. William Basil OFFUTT + Katharine Mary HALL 3. William Augustus OFFUTT + Mary Emily HOLMAN 4. Clagett OFFUTT + Jane Pinkney BUCKNER 5. Joeseph Clagett OFFUTT + Aletha Magruder CLAGETT 6. Basil OFFUTT + Eleanor Hawkins CLAGETT 7. Zachariah OFFUTT + Eleanor BEALL 8. John OFFUTT + Esther JACKSON 9. William OFFUTT + Mary BROCK