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Dictionary of Medieval Names
from European Sources

Lois f. Ancient Greek Λωΐς, of uncertain origin.

The name of a minor New Testament character. Wycliffite Bible (1395): Loid.

The name came into use in England in the 2nd half of the 16th C. Withycombe s.n. Lois indicates the earliest instance is from 1583 in Lincolnshire.

England
Early Modern English
1587 Lois StAnthonlin p. 32
Cite as: S.L. Uckelman. "Lois". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 3. http://dmnes.org/2016/3/name/Lois.