The proper technique to pronounce the Chinese language title “Zhang” is with a tough “g” sound, as within the English phrase “gong”. The “zh” is pronounced equally to the “j” within the English phrase “leap”. Subsequently, the title “Zhang” is pronounced as “jahng”.
You will need to pronounce Chinese language names accurately to indicate respect for the tradition. Mispronouncing a reputation will be seen as impolite or disrespectful.