Dictionary of Medieval Names
from European Sources

Sarwin m. Proto-Germanic *sarwō '(war) equipment' + Old High German wini 'friend'.

France
Latin
c823 Saroinus (nom) irminon-vol2 30, CE
Cite as: S.L. Uckelman. "Sarwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Sarwin.