Dictionary of Medieval Names
from European Sources

Grossa f. Latin grossa 'great, large; thick; coarse'.

France
Latin
1147 Grossa (nom) clairvaux-12thc 19, Grosse (gen) ibid. 19
Cite as: S.L. Uckelman. "Grossa". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Grossa.