Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SLOW
As described in historical dictionaries
Patronymica Britannica (1860)
SLOW. Quick being a surname, this mightnaturally beregarded as its antithesis ; but it is uot so, as it lias a local meaning. Its medieval forms are De la Slo, Ad le Slow, or De la Slou. H.R. Its meaning appears to be A-Sax. slog, 0. Eng. slogke, a bog or muddy pit — a slough.