Where does “Блакторн” come from?

Блакторн (Bulgarian) comes from English blackthorn, from English thorn, from Middle English þorn, from Old English þorn, from Proto-West Germanic þorn, from Proto-Germanic þurnuz, from Proto-Indo-European tr̥nós, from Proto-Indo-European (s)ter- — strong, firm, stiff, rigid; rigid, stiff; to...

Ancestry of “Блакторн”, step by step

StepLanguageWordMeaning
1EnglishblackthornA large shrub or small tree, "Prunus spinosa",...
2EnglishthornA sharp protective spine of a plant; Any shrub or...
3Middle EnglishþornAlternative form of thorn
4Old Englishþornthorn; thorny bush; the runic character ᚦ; the...
5Proto-West Germanicþornthorn, briar
6Proto-Germanicþurnuzthorn, briar
7Proto-Indo-Europeantr̥nóssharp, stiff
8Proto-Indo-European(s)ter-strong, firm, stiff, rigid; rigid, stiff; to...
Every word from Proto-Indo-European (s)ter-Every word from Proto-Indo-European tr̥nósEvery word from Proto-Germanic þurnuz