The spelling of "Sieren" is not straightforward when it comes to its pronunciation. In IPA phonetic transcription, "Sieren" is spelled as /ˈsiːrən/. The sound /s/ in the beginning is followed by a long vowel sound /i:/, represented with two dots above the letter i. The letter r is pronounced with a rolled or trilled sound /r/. The final syllable is pronounced with the reduced vowel sound /ən/, which can be compared to the short /uh/ sound in "fun". So, the correct pronunciation of "Sieren" is "SEE-ruhn."