Dictionary of Medieval Names
from European Sources

Bertleis f. Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz + an uncertain element, perhaps related to Old Saxon *lēkian, Old High German *leihhen, *leichen 'to dance, sport, play'.

France
Latin
c823 Bertleis (nom) irminon-vol2 6, Ved
Cite as: S.L. Uckelman. "Bertleis". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Bertleis.