The tribe of Judah?
Not necessarily...
He can be also Efraim and Menashe I think.
He could be from
any tribe. Even if Yisroel (as in the kingdom) was exiled, you have to remember this:
Yerushalayim, in Yehudah, was an international city. There were significant populations of
every tribe there. So a Jew today who is "Yisroel," and not a Kohen or Levi, could really be from any of the other 12 tribes.
The tribe of Judah?
Not necessarily...
really, it doesn't matter...Jew is a Jew.
Correct.