The word "Blackmon" is spelled with the IPA phonetic transcription of /blæk.mən/. The first part of the word, "black," is pronounced as /blæk/, with the "a" sound being short, as in "cat." The second part of the word, "-mon," is pronounced as /mən/, with the "o" sound being short, as in "lot." The spelling of this word follows basic English spelling rules, where "ck" is used instead of "k" after a short vowel sound.
There doesn't seem to be a widely recognized etymology for the word blackmon. It's worth noting that blackmon doesn't appear in most dictionaries or etymology resources, which suggests that it may not have a well-established origin or history. It's possible that it could be a variation or variant spelling of another word, or it might be a specialized term or slang that is used in a specific context or region. Without further information or context, it is challenging to determine the precise etymology of blackmon.