Dictionary of Medieval Names
from European Sources

Reina f. Proto-Germanic *ragin 'counsel, might', or a pet form of any of various names beginning with this element.

France
Latin
1013 Rayna (nom) CartSavII 8
Cite as: S.L. Uckelman. "Reina". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Reina.