I was reading an old thread about this subject (viewtopic.php?f=15&t=693) and decided to create my own instead of bumping it

I am 100% Polish and can speak the language fluently and I have great interest and desire to learn Russian in college. I have taken preliminary steps towards learning the Russian language, such as learning and understanding the Cyrillic alphabet, listening to Russian songs, watching Russian movies w/ English subtitles, reading (or at least attempting ) wiki articles in Russian, and, of course, reading the lessons on this site. I have also found that knowing Polish has helped me discern the meaning of many Russian words.

I have two questions. The first question being about the Cyrillic form of my last name. My last name is spelled Grzechnik (if you are unsure of the pronunciation, type it in here and listen here: http://www.ivona.com/). The best I can come up with is "Гжехник," but I am sure you guys can correct me if I'm wrong.

My second question, which is more related to the original thread, is whether it would be insulting to Russians for me to use a patronymic form of my name if I were to go to Russia? I would also be worried as to whether it would sound unusual to native Russians. My fathers name is Sławomir, and since there is no ł sound in Russian, the Cyrillic form would be (or at least I think) Славомир. So my full name, including patronymic, would be Пётр Славомирович Гжехник (Piotr Slavomirovich Grzechnik), assuming I got my last name in correct Cyrillic form.

Thanks.