Daniel, Hananiah, Mishael and Azariah were young men from where?

Answer: Judah

Among the young men brought to serve in Nebuchadnezzar's court were some from Judah: Daniel, Hananiah, Mishael, and Azariah.

“Among these young men were some from Judah: Daniel, Hananiah, Mishael, and Azariah.”— Daniel 1:6 (BSB)