The spelling of the word "koenen" can be explained through its IPA phonetic transcription. The first syllable "koe" is pronounced as /kø/, with the Dutch vowel sound of "ö," which has a rounded and closed mouth position. The second syllable "nen" is pronounced as /nən/, with the schwa sound in the first and last letter and a clear /n/ in the middle. The spelling of "koenen" is unique to Dutch and can be traced back to its Germanic roots.