Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
VALLET
As described in historical dictionaries
Patronymica Britannica (1860)
VALET. VALLET. An attendant upon a great man. In ro3'al households there were valetti ad coronam, " Valets of the Crown." See Jacob's Law Diet.