the Hivite

This is the name of a people group. See how you translated the similar word "Hivites" in Genesis 10:17. (See: rc://en/ta/man/translate/translate-names)

the prince of the land

This is referring to Hamor not Shechem. Also, "prince" here does not mean son of a king. It means Hamor was the leader of the people in that area.