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Dictionary of Medieval Names
from European Sources

Blithe f. Old English blīþe 'happy, joyful, glad'.

England
Early Modern English
1583 Blith StAnthonlin p. 30
Cite as: S.L. Uckelman. "Blithe". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 3. http://dmnes.org/2016/3/name/Blithe.