Dictionary of Medieval Names
from European Sources

Altberta f. Old High German alt, Old Saxon, Old Frisian ald 'old' + berht 'bright'.

Some forms of this name are impossible to distinguish from forms of Alberta.

France
Latin
c823 Aldeverta (nom) irminon-vol2 27, CE
Cite as: S.L. Uckelman. "Altberta". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Altberta.