Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SWANN
As described in historical dictionaries
Patronymica Britannica (1860)
SWAN. SWANN. I. Perhaps the same as Swaine. 2. The bird was famous in old heroic times, both as a dainty of the table, and as an heraldric badge. Edw. III. used to swear by it. See Curios. Herald. 154. One Bartholomew le Swan occurs in the archives of Battel Abbey. 3. Sn-dn, A-Sax., a herdsman or pastoral servant.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English