The spelling of the word "wilborn" can be explained using the International Phonetic Alphabet (IPA). The first syllable is pronounced as "wɪl," with a short "i" sound, as in "sit." The second syllable is pronounced as "bɔrn," with an "o" sound as in "born." Therefore, the correct spelling of this word should be "Wilborn" with a capital "W." However, it is important to note that the spelling of names can vary due to cultural or personal preferences.