Dictionary of Medieval Names
from European Sources

Haldor m. Old Icelandic hallr 'rock, stone' + Old Icelandic Þórr, the name of the god of thunder, deriving from Proto-Germanic *þunraz 'thunder'.

Found in Scandinavia, and in areas of Scandinavian influence such as the Danelaw. In Finland and Estonia from the 1500s, the variant form Hallor was used.

Estonia
Middle Low German
1592 Halli Tiik1977 p. 286, Hallo ibid. p. 286
Iceland
Middle Icelandic
1504 Halldor (nom) DipIs-7 655, Halldorz (gen) ibid. 655
Sweden
Latin
1350 Haldorus (nom) SDHK no. 6054
Cite as: R. Le Get, S.L. Uckelman. "Haldor". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Haldor.