Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
TEGG
As described in historical dictionaries
Patronymica Britannica (1860)
TEGG. A sheep In Its second year. Halliwell quotes from Florio — " A terj or sheepe with a little head, and wool! under its belly." The word is also applied by Palsgrave to a young deer in its second year. Comp. Prickett.