The spelling of the word "Herdon" can be explained using IPA phonetic transcription. It is pronounced as /ˈhɜrdən/ with stress on the first syllable. The first two letters "he" are pronounced with an open vowel sound "ɜ", followed by "r" which is pronounced with a rolling sound. The "d" is pronounced softly, followed by the "o" which is pronounced with a schwa sound "ə". Lastly, the "n" is pronounced with the usual "n" sound. Overall, the spelling of "Herdon" accurately reflects its pronunciation.