Who are the origin of Hebrew people and the land ? Genesis 40:15 I found the word Hebrew appear in Genesis 40:15


  New International Version I was forcibly carried off from the
  land of the Hebrews, and even here I have done nothing to deserve
  being put in a dungeon.


I'm unable to understand the sentence of the verse above.... because to me it can mean :
A. Joseph is not a Hebrew but he live in the land of the Hebrews before 
B. Joseph is a Hebrew and he is indirectly telling to whom he talking with that he is a Hebrew.


  New Living Translation For I was kidnapped from my homeland, the
  land of the Hebrews, and now I’m here in prison, but I did nothing
  to deserve it.


This verse is clearer to me, it's B.
But still I'm lost as I can't find in the Bible how is the origin of Hebrews people and the Hebrew Land even after I go back to the story from Abraham. 

Abraham is from Ur-Kasdim, and from this wiki it said it's in the land of Mesopotamia. And wiki also said that this is Abraham's native land. So my own conclusion : Abraham is not a Hebrew, and I think he is Sumerian.

Later on Abraham is in Canaan land, which I assume the natives there are Canaanites. 
Next, I think Isaac was born in Canaan Land. Later, I think Jacob was also born in Canaan Land.
After that I'm lost as it's not clear to me where the 12 children were born and their native. Maybe because I didn't read the story thoroughly.


  A man who had escaped came and reported this to Abram the Hebrew.


I found that Abraham is referred as a Hebrew in Genesis 14:13.
But how did he get it ? I mean when I put the story-teller position is in around at the actual time of the event, then where is the land of the Hebrews at the time of Genesis 14:13 happen ? Who are the other Hebrews besides Abraham at that time ?
Abraham is the patriarch of the Hebrew people. All the other Hebrew people are descended from him, or married into their group, or were attached to them as servants.

Abraham had 318 trained servants accompany him to rescue his brother Lot who was kidnapped in Genesis 14. This site (https://www.studylight.org/language-studies/difficult-sayings.html?article=509) claims that Abraham had a retinue of about 2,000 people, including his children and servants.

The only land that Abraham owned was what he purchased as a grave site for his wife. He was a nomad, but often stayed among the Canaanites.