I can do research on both names. Robicek is not Polish, however. With diacritics, this form would be Czech or Slovak. Also, there is no Robiczek attested today in Poland, although there are some related names. Yes, as you suggest, they could have changed the spelling. I am a linguist and could suggest some related spellings as the original name. For each surname I offer a linguistic analysis and provide information on origin and meaning based on linguistic evidence. I also provide information on frequency and distribution of surname in contemporary Poland. My fee is $29.00 per surname plus SASE. Please provide any alternate spellings you are aware of. My address is: J. Piszczor 4307 Caleta Drive, No. 207 Irving TX 75038 Please e-mail any additional questions.