aleph-bet-reish-hay-mem
Abraham Chaim = אברהם חיים
Isaac son of Abraham = Yitz'chak ben Avraham (יצחק בן אברם)
Avraham, av ha-ivrim (אברהם, אב העברים)
you were the God of Abraham = hah-YEE-ta el-o-hey ahv-rah-HAHM (היית אליקי אברהם)
they didn't "become" Hebrew. They started out as Hebrew, because Abraham was a Hebrew.
Yes, Abraham was the first Hebrew.
The word "Hebrew" comes from the Hebrew word "Avar", which means to cross, or to pass. Abraham crossed the Jordan river on his way the Canaan, and so became the first Hebrew.
GEN 14:13 Abraham was called "the Hebrew" the frist time in the bible in Genesis 14:13
Abraham
Abraham.
No, he was not Jewish.
If we're discussing biblical figures, then yes. Abraham was the first person referred to as "Hebrew", and Jacob was Abraham's grandson.