My legal name is Mirosław Długosz-Zalewski, but I go by Mirek Długosz (Dlugosz)
It’s pronounced [ˈmɪrɛk ˈdwuɡɔʂ]. It sounds something like “Me - wreck D’lugosh”.
“Mirek” is diminutive of “Mirosław”. It’s the same name, just little easier to pronounce and write.