The proper spelling of the word "Seigworth" is not widely known, as it is not a commonly used word. However, according to the International Phonetic Alphabet (IPA), the word is pronounced as "sɪɡwɜrθ." The IPA explains that the word is spelled with a "s" sound followed by a short "i" sound, a "g" sound, and a long "w" sound. The phonetic transcription also includes the pronunciation of a short "ɜ" sound and a "th" sound at the end of the word.