The spelling of "Vesyegonsky" is complicated due to its unique Russian pronunciation. To explain the spelling, we can use the International Phonetic Alphabet (IPA) transcription. The first syllable "Ve" is pronounced as /vɛ/, the second syllable "syeg" is pronounced as /sʲɪɡ/, the third syllable "on" is pronounced as /ɔn/, and the final syllable "sky" is pronounced as /skʲi/. Therefore, the correct spelling of this word is "Vesyegonsky" in English, which accurately represents its Russian pronunciation.