The name "Bartholomaus von Carneri" is a tricky one to spell, but it follows the standard pronunciation rules of German. The first name is pronounced "bar-tuh-LOH-mow-us" and the last name is pronounced "KAHR-nuh-ree." The letter "th" is pronounced as a hard "t" sound, and the letter "c" is pronounced as a soft "s" sound. The use of the letter "e" at the end of both names indicates a long vowel sound. Overall, mastering the spelling of this name requires an understanding of German phonetics.