Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
KEYSER
As described in historical dictionaries
Patronymica Britannica (1860)
KEYSER. German, kaiser, an emperor, a Ca3sar. This name must be an importation from Germany, where it was probably first applied as a sobriquet. See Lemiriere,
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English