Why we are called "Jews"

Hi,

A midrash regarding Yehudah's reward for acknowledging his responsibility for Tamar's pregnancy:

"[Yaakov said, in Bereishit 49:8:] 'Yehudah, your brothers praise you' – Your brothers praise you, your mother praises you, I myself praise you.

"R' Shimon bar Yochai said: May all of your brothers be called upon your name. One does not say, 'I am Reuveni' or 'I am Shimoni,' but 'I am Yehudi.'"

(Midrash, Bereishit Rabbah 98:6)

Have a great day,
Mordechai