Dictionary of Medieval Names
from European Sources

Donagnesia f. Italian donna 'lady' from Latin domina 'lady' + Agnesia, an Italian form of Agnes.

It is possible that this is not a compound name, but a title, Don(n)a, + given name, Agnesia. It is impossible to tell from the context of our single example.

Italy
Latin
1265x1339 Donanexia (nom) BBC-Berg 409
Cite as: S.L. Uckelman. "Donagnesia". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Donagnesia.