Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
OTTER
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) Oitir, Gaelic, a low promontory jutting into the sea, a shoal.
Patronymica Britannica (1860)
OTTER. A Scandinavian personal name of great antiquity, and common application. It is variously spelt Otter, Ohter, Other, Othyr, Ottyr, Oter, and in Domesday
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Nickname
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English