Shyeh-myeh-nyook
Here's a breakdown:
* Siem: Pronounced like "Shyeh"
* ie: Pronounced like "yeh"
* mi: Pronounced like "myeh"
* ni: Pronounced like "nee"
* uk: Pronounced like "ook"
Note: The "i" in "Siem" and "ie" is pronounced like the "i" in "machine." The "u" in "uk" is pronounced like the "u" in "put."
Let me know if you'd like to hear how to pronounce other Polish names!