Dictionary of Medieval Names
from European Sources
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Ruby f. Middle English rubie from Old French rubi(s), rubïe 'ruby'.

Withycombe s.n. Ruby is incorrect when she calls it a modern coinage.

England
Early Modern English
● 1581 Ruby DEmar-vol2 p. 6
Cite as: S.L. Uckelman. "Ruby". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2023, no. 1. http://dmnes.org/2023/1/name/Ruby.