The word "gertz" is spelled with a hard "g" sound followed by the vowel sound "er". In IPA phonetic transcription, this would be written as /ɡɜːrts/. The "g" sound is made with the back of the tongue touching the soft palate, while the "er" sound is made by tensing the muscles in the tongue and throat. The spelling of "gertz" may be confusing for those who are not familiar with English pronunciation, but it is a common surname with German roots.