The spelling of the word "otto casmann" can be explained using IPA phonetic transcription. "Otto" is pronounced as /ˈɒtəʊ/, with stress on the first syllable and a slightly rounded "o" sound. "Casmann" is pronounced as /ˈkæzmən/, with stress on the second syllable and a "z" sound in the middle. The spelling of both words follows the typical conventions of English, with one notable exception being the double "n" at the end of "Casmann" which is not typical.