Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
LEMON
As described in historical dictionaries
Patronymica Britannica (1860)
LEMON. O. Eng. lemma?!., paramour, sweetheart — an A- Sax. and C!haucerian word. One " Alan, the sonof theLeman," occurs iu the Hundred Rolls. Its primary meaning seems to be, a person much beloved, or very dear.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic