Þorvaldsdóttir is a surname of Icelandic origin, meaning daughter of Þorvald. In Icelandic names, the name is not strictly a surname, but a patronymic.
Jóhanna Bergmann Þorvaldsdóttir is an Icelandic farmer responsible for saving the Icelandic goat through breeding them at her farm, Háafell in Borgarbyggð, Iceland.