Dictionary of Medieval Names
from European Sources

Rathelm m. Old Saxon rād, Old High German rāt 'counsel, advice' + Old High German, Old Saxon helm 'helmet'.

France
Latin
c823 Rathelmus (nom) irminon-vol2 65, Ved
Cite as: S.L. Uckelman. "Rathelm". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Rathelm.