Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
FLEET
As described in historical dictionaries
Patronymica Britannica (1860)
FLEET. A-Sax. fleot. A harbour for vessels, an arm of the sea, a haven ; hence Northfleet, youthfleet, and the Fleet, a tributary of the Thames, which gave name to Fleet Street. The celebrated jurist, Fleta, is said to have adopted that name, about temp. Edw. II., from his l.aviug been a prisoner in the Fleet at the time when he wrote his treatise on the common law. Fuller's Wor. ii. 36(5. There are parishes in cos. Dorset and Lincoln so called.
Surname type: Nickname
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English