Trousdeloup is a French surname that is pronounced as "trus-dəlu". The first syllable "trus" is pronounced with a short "u" sound, similar to the English word "bus". The second syllable "de" is pronounced with a soft "d" sound, similar to the English word "day". The third syllable "lu" is pronounced with a short "u" sound as well, but with a more rounded lip shape. The final "p" is silent, and the stress is on the second syllable.