Micaiah is mentioned only here in the Old Testament. He is the son of Gemariah, mentioned in the previous verse.
Scroll translates the same word used in verse 8.
Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on Jeremiah. (UBS Helps for Translators). New York: UBS, 2003. For this and other handbooks for translators see here .