The word "Kestler" is a surname that is spelled "kes-tuh-ler" in IPA phonetic transcription. The "k" sound is pronounced as in "kite", followed by the short "e" sound as in "pet". The "s" is pronounced as in "snake", followed by the "t" sound as in "top". The second syllable begins with a short "e" sound again, followed by the "l" sound as in "love", and ending with the "er" sound as in "hiker". Together, these sounds form the name "Kestler".