The surname Sobieski is known since 1470-1480. The first record about this surname mentions Nicolaus Szobyeszky (it means Sobieski in old Polish spelling) de armis Janyna (with Coat of Arms Janina). The most famous person of this surname, John III Sobieski (1629-1696), was Polish king.And I got this from your link:The surname Sobieski is popular in contemporary Poland - there are 2281 Sobieskis, most of them in the voivodships of: Warsaw (325), Ostroleka (259), Olsztyn (134), Wroclaw (124), Gdansk (106), Lomza (104), Szczecin (96), Katowice (95), Siedice (82).
This surname information was obtained from;
Wanda Makula Kosek
INSTYTUT JEZYKA POLSKIEGO PAN
AL.MICKIEWICZA 31
31-120 KRAKOW
POLAND
Liliane Rudabet Gloria Elsveta Sobieski (born June 10, 1982 in New York City), better known as Leelee (or LeeLee) Sobieski, is an American actress, born to a French-born father of somewhat royal Polish ancestry, and a half-Jewish American mother.
Somewhat royal? So is he related to King Sobieski? Funny, they didn't have any more information about the father. I guess we need more info, huh?
But looky here... let's see what one of King Sobieski's descendants say... did I just say descendant?
Now I got some work to do.
Ciao.
We will never find anything reliable to confirm her claims. Only skilled historians of Poland are able to do that. I think that if she claiming something then she should also provide some proofs to confirm her version.