←
Proto-Germanic *teudrą (inherited)←
Proto-Germanic *þeuraz (inherited)←
Proto-Indo-European *táwros (derived)←
Norwegian Nynorsk tjora (link)←
Norwegian Nynorsk tjore (link)←
Old Norse tjóðr (inherited)←
Old Norse þjórr (inherited)→
Norwegian Nynorsk tjore (affix)