Isaiah 10:28 (King James Bible) at Michmash he hath laid up his carriages
In the printer’s manuscript, the names Midian and Michmash were misspelled as Mideon and Mishmash. It appears that biblical names were frequently not spelled out for the scribe. For the case of Mideon, we see the possible influence of the name Gideon, for Mishmash the influence of the English word mishmash (common from the 15th century on). The 1830 compositor set the correct spelling for both these names. For discussion regarding the spelling of biblical names, see 1 Nephi 11:13. Also see the discussion below regarding the Book of Mormon spelling Ramath (in 2 Nephi 20:29).
Summary: Maintain the King James spellings Midian and Michmash in the Isaiah quotations.