Burdakji,
I wonder why you have not concentrated on Yugoslavia and its former republics especially slovakia where "Burdak" is a common surname. Some Burdaks are in Canada also who must have shifted from Eastern Europe. In fact, one Karl Burdak is the General Counsel of Canada. Anyway, as far as Ukraine is concerned, my own perception is that, apart from historical connnections, some enterprising jats must have gone there for business purposes in 16th and 17th century when opium, (which used to grown mostly in jat dominated areas) was an important commodity of export to Ukraine from India. I wonder, if Dekhavich is Dahiya. Similarly Budrak, Burdakov, Burdenko, Burdeinik, Burdaevs are quite familiar names in Ukraine. I am of the the view that the word "Dahiya" must have got corrupted as there is no alphabate for "Hai" in Russian and "Gai" Russian and they are most represented by "Khai", a very funny purnunciation (as if clearing threats).