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Dictionary of Medieval Names
from European Sources

Tiffany f. Latin theophania, from Greek θεοφάν(ε)ια 'manifestation of God'.

The name of a Holy Roman Empress.

Theophania was another name for Epiphany, and in England, the name was used of girls who were born or christened on or near that holiday.

England
Early Modern English
1551 Tyffyn DEmar-vol1 p. 79
France
Latin
1147 Theophania (nom) clairvaux-12thc 19, Theophanie (gen) ibid. 19; 1301 Teophanie (gen) MemPic-vol17 p. 214, Theophania (nom) ibid. p. 208, Theophanie (gen) ibid. p. 202
Old French
1296 Tyfoinne paris1296 p. 11; 1313 Thiephaine Paris1313 p. 33, Thifaine ibid. p. 16, Thiphaine ibid. p. 39
Middle French
1562 Typhagne RegPCC-1 p. 9; 1563 Tiffagne ibid. p. 20; 1564 Tiphaine ibid. p. 99; 1565 Tiphaine ibid. p. 139; 1567 Tiphaine ibid. p. 303; 1568 Tiphaine ibid. p. 389; 1571 Tiphaine ibid. p. 481
Germany
Latin
988 Theophanu (gen) HambUrk-vol1 XLIX
Cite as: S.L. Uckelman. "Tiffany". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Tiffany.