Dictionary of Medieval Names
from European Sources

Ostosia f. A derivative of Proto-Germanic *austraz 'eastern'.

Spain
Latin
954 Ostosia (nom) CDGH XLVII, ostosie (gen) ibid. XLVII
Cite as: S.L. Uckelman. "Ostosia". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Ostosia.