Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
LETT
As described in historical dictionaries
Patronymica Britannica (1860)
LETT. A Livonlan. One Let was a tenant in co. Gloucester before the Conquest. Domesday.
Surname type: Diminutive
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English