John Gill Commentary 1 Chronicles 12:4

"and Ishmaiah the Gibeonite, a mighty man among the thirty, and over the thirty, and Jeremiah, and Jahaziel, and Johanan, and Jozabad the Gederathite," — 1 Chronicles 12:4 (ASV)

And Ishmaiah the Gibeonite, a mighty man among the thirty, and over the thirty That came with him, and he had the command of; this man was of Gibeon, another city in the tribe of Benjamin, (Joshua 18:25) and Jeremiah, and Jahaziel, and Johanan, and Josabad, the Gederathite ; one of Gederah, a city in the tribe of Judah, perhaps on the borders of that and Benjamin; Joram speaks of it as belonging to the country of the city Aelia or Jerusalem.