Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
HELME
As described in historical dictionaries
Patronymica Britannica (1860)
HELM. HELME. Teutonic, a helmet ; a name borrowed from military associations. " Helm as a termination entered into a gi-eat number of regular Anglo-Saxon names, such as Eadhelra, Brighthelm, Alfhelm, &c. Wilhelm (William) is an earlier name, occurring in the genealogy of the East- Anglian kings from Woden." — Ferguson.