וַיִּקְרָא֙ מֶ֣לֶךְ יִשְׂרָאֵ֔ל אֶל־סָרִ֖יס אֶחָ֑ד וַיֹּ֕אמֶר מַהֵ֖ר מיכהו [מִיכָ֥יְהוּ] בֶן־יִמְלָֽא׃
Then the king of Israel called an officer, and said: ‘Fetch quickly Micaiah the son of Imla.’
Rashi on II Chronicles
Bring Micaiah at once [Micaiah] is written with the “yud” missing. He called him by a different name, Micahu, in order to degrade him.