Your post is from quite a few years ago. Not sure if your still researching. My name is Lauren Dallago. Hajduk is one of the many variations I have come across. My great grandfather was Michael A. Haydak born 1889. He came to the United States from Russia with a brother from what I am told. They settled in PA. Michael sometime bwt 1920-1922 moved to New Jersey with his wife (Anna) and daughter (Helen). If interested you can email me @ email@example.com
or on ancestry.com (L_Dallago)
Hope to hear from you.