←
English thorn (cognate)
←
Proto-Germanic *þurnuz (inherited)
←
Proto-Indo-European *tr̥nós (inherited)
←
Proto-Indo-European *(s)ter- (mention)
←
Norwegian Bokmål torn (cognate)
←
Old Norse þorn (inherited)
→
English thorn (mention)
→
Old English þorn (cognate)
→
Norwegian Bokmål torn (cognate)
→
Norwegian Nynorsk torn (cognate)
→
Old Saxon thorn (cognate)