Where does “Тахтунов” come from?

Тахтунов (Bulgarian) comes from Romanian taht, from Ottoman Turkish تخت, from Persian تخت, from Middle Persian tʾht', from Proto-Iranian *táxtah, from Proto-Indo-Iranian *táktas, from Proto-Indo-European (s)teg- — to cover; pole, stick, beam.

Ancestry of “Тахтунов”, step by step

StepLanguageWordMeaning
1Romaniantahtthrone
2Ottoman Turkishتختthrone; sofa; seat
3Persianتختflat; throne; capital
4Middle Persiantʾht'throne
5Proto-Iranian*táxtah—
6Proto-Indo-Iranian*táktas—
7Proto-Indo-European(s)teg-to cover; pole, stick, beam
Every word from Proto-Indo-European (s)teg- →Every word from Proto-Indo-Iranian *táktas →Every word from Proto-Iranian *táxtah →