Þorwīf is a postulated Anglo-Scandinavian hybrid name formed from the Old Norse element Þor– from the god Þórr ‘Thor‘ combined with the Old English element wīf ‘woman, wife’.
Forms of Þorwīf are attested in medieval Yorkshire charters.
Gillian Fellows Jensen, Scandinavian Personal Names in Lincolnshire and Yorkshire. Copenhagen: Akademisk Forlag (1968), pp. 317-318, 346.