According to Roth, there are thousands of Jews and non-Jews who can trace their ancestry to the Davidic line. At the convention DNA samples will be taken from those in attendance and tested. Research carried out a few years ago on male Kohanim descended from the Jewish priestly line of Aharon revealed a mutation on the Y-chromosome in some 85 percent of those tested, confirming the existence of a single common ancestor. Roth hopes that similar dramatic findings will result from testing the Davidic royal line.
Proportionally only a few of the royalty lines are known, the rest have been obscured by time. What is known is that 15 Jewish families have traditionally claimed to have descended from King David.
Twelve of those families trace themselves back to Rashi, who was descended from the marriage between King David and Hagit. The families include: Abarbanel, Berdugo, Don Yehiya, Halperin, Harlap, Horowitz, Katzenelbogen, Lurie, Rabinowitz, Shaltiel, Shapira, and Weil. Three families, go back to Solomon's line from the marriage of Batsheva and David, which is the messianic line. Those families are Dayan, Elfandari and Peretz.
Not much other info there, site is under construction.
Well, Rabinowitz is just a Slavic name for son of a rabbi - "rabin". So you could translate the name into English "Rabbison". The name "Milosevic" or "Miloshevich" means son of Milosh. Unfortuantely the name Davidovich means also the son of a common David, not a king.