Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
LUTHER
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
The widely famed or celebrated, derived from the German loth or laut, loud, famed, fortunate, and er, honor--"fortune and honor." Lauter, Ger., bright, clear, pure.
Patronymica Britannica (1860)
LUTHER. As an English surname probably a corruption of the great northern name Lowther. It may however be identical with the Teutonic Luther, Lothaire, Lothario, &c. One of the Saxon kings of Kent was a Lothere.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English