Johanan.

Jeremiah 41:2, 3, 7
Ishmael son of Nethaniah and the ten men who were with him got up and struck down Gedaliah son of Ahikam, the son of Shaphan, with the sword, killing the one whom the king of Babylon had appointed to govern the land. . . .

Jeremiah 40:7, 8, 13-16
When all the commanders and men of the armies in the field heard that the king of Babylon had appointed Gedaliah son of Ahikam over the land and that he had put him in charge of the men, women, and children who were the poorest of the land and had not been exiled to Babylon, . . .

Jeremiah 42:1, 3
Then all the commanders of the forces, along with Johanan son of Kareah, Jezaniah son of Hoshaiah, and all the people from the least to the greatest, approached . . .

Jeremiah 43:2-5
then Azariah son of Hoshaiah, Johanan son of Kareah, and all the arrogant men said to Jeremiah, "You are lying! The LORD our God has not sent you to say, 'You must not go to Egypt to reside there.' . . .