Dictionary of Medieval Names
from European Sources

Thorbiorn m. Old Icelandic Þórr, the name of the god of thunder, deriving from Proto-Germanic *þunraz 'thunder' + Old Icelandic bjǫrn 'bear', influenced by Old English bera, *beorn 'bear'.

England
Latin
1189 Turbern (nom) GASurv p. 110; 1222 turberni (gen) StPaulDom p. 96
Iceland
Middle Icelandic
1500 þorbiorn (nom) DipIs-7 489
Ireland
Latin
fin12thC Turbeorn (gen) MunDocIr III, p. 8
Cite as: S.L. Uckelman. "Thorbiorn". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Thorbiorn.