The spelling of the word "Mattaus" is actually incorrect, as the correct spelling is "Matthews". The reason for this spelling mistake may be due to the name being spelled phonetically. The IPA phonetic transcription for "Matthews" would be /ˈmæθ.juz/. The "th" sound is represented by the Greek letter theta, pronounced as "th" in "think". The "s" at the end is also pronounced, unlike in the similar name "Matthew".