The spelling of the surname "Sheffler" is fairly straightforward once you understand the principles of English phonetics. The word can be broken down into two syllables: "Shef" and "ler." The "Sh" sound at the beginning is represented in IPA phonetics by /ʃ/, while the "E" in "Shef" is pronounced as /ɛ/. The second syllable, "ler," is pronounced with an unstressed schwa sound /ə/ followed by the letter "L." So the complete IPA transcription for "Sheffler" would be /ˈʃɛflər/.