Family History and Genealogy Resources by Surname
Leavenworth Surname Origin
(Origin Local Welsh) Llyvngwerth, the smooth, level farm, castle or court, or the worth or place on the river Leven.
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
Leavenworth Surname Meaning and Family Facts
There is more to Leavenworth family history than the origin of your surname:
A Leavenworth Family History Thought:
'The past isn't dead. It isn't even past.' --William Faulkner