Dictionary of Medieval Names
from European Sources

Giselhard m. Old High German gīsal 'pledge, hostage' + Old Saxon hard, Old High German hart 'strong, hard'.

France
Latin
814 Gisilardus (nom) StVdM-II G9; c823 Gislehardus (nom) irminon-vol2 51
Cite as: S.L. Uckelman. "Giselhard". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Giselhard.