DENNETT

DENNETT. 1. A diminutive of Denis. 2. There is an unsupported tradition in the Sussex family that the name was originally At Denne, or Dean, and that by a syllabic transposition it became Den-At or Dennett.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.