Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SMELT
As described in historical dictionaries
Patronymica Britannica (1860)
SMELT. A-Sax. mild, gentle. A priest mentioned in the Codex Diplomaticus bore this appropriate name. H.E. Smelt, Sraelte.