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Dictionary of Medieval Names
from European Sources

Theodehard m. Gothic þiuda 'people, folk' + Old Saxon hard, Old High German hart 'strong, hard'.

France
Latin
c823 Teudhardus (nom) irminon-vol2 30, Gaugiacum
Germany
Latin
822x875 Thiadhardus (nom) TradCorb §66; 948 Thidardo (abl) HambUrk-vol1 XXXV; 1216 Dithardus (nom) hennes-vol1 22
Latvia
Latin
1299 Dethardus (nom) RigSB 88; 1300 Dethardo (dat) ibid. 420; 1301 Dethardus (nom) ibid. 311; 1302 Dethardo (dat) ibid. 192; 1303 Dethardi (gen) ibid. 373, Dethardo (dat) ibid. 373, Dethardus (nom) ibid. 96; 1304 Dethardo (dat) ibid. 200; 1307 Dethardo (dat) ibid. 109, Dithardus (nom) ibid. 107; 1317 Dethardo (dat) ibid. 319; 1319 Dethardo (dat) ibid. 114, Dethardus (nom) ibid. 320; 1333 Dethardus (nom) ibid. 321
Poland
Latin
1251 Dithardus (nom) hennes-vol1 141
Cite as: S.L. Uckelman. "Theodehard". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Theodehard.