I'm toward the end of the quest , and I need to know, who is the owner of the golden claw, and where is the owner?

the trader in riverwood.

Thank you very much

Another thing to add, there is a journal on the dead elf's body after you take the claw off of him. He writes how he took it from the store owner in Riverwood. I like how they put stuff to read and figure out in the text. Reminds me of Uncharted where you use notes in your book to solve a puzzle.