My family's surname is Eastlack, but my dad has traced it back to the Eastlakes of Devonshire England. Our ancestor's name was Samuel Eastlack and he was a Quaker Pastor in England. Due to persecution there, he moved to Bermuda. He then moved to south Jersey, where my dad and his family grew up. I don't know about a book and I'm not sure about Francis Eastlake, but I would love to know the connection between the two! Please let me know if you find out any more information!