RHBA identifies H as "charcoal colored."
Palestinian Talmud, Halakah 6, trans. Heinrich W. Guggenheimer, 41
Rabbi Hiyya bar Abba said, by their families they left the Ark; since they refrained from their relations they merited to be saved from the Deluge. You may know that it is so since we stated, Ham, the dog, and the raven misbehaved. Ham exited charcoal colored [חַם יָצָא מְפוּחָם; ham yatza mepuham]. The dog exited public in his relations. The raven exited different from the creatures.
Note the Hebrew repetition of the word "Ham" in the proper name and the adjectival construction: "charcoal colored." The wordplay implies that the proper name, "Ham," is equivalent to "charcoal." By this point, the name, "Ham" and the adjective hwm had become conflated.