The following is an excerpt from The Leffingwell Record.
Read it or download it for free at
http://www.archive.org/details/leffingwellrecor00leff
I also found a source online for getting a CD with the whole book.
http://www.digital-editions.com/LEFFINGWELL.htm
I am researching my family (Leapingwell ) and feel there is a connection with your Thomas Leffingwell the family lived in Essex and were landowners I have found a John Leapingwell married to a Frances
John died in 1646 in Kelvedon Essex some times the name was spelt Lepingwell, leppingwell..