This site will help you with that.
http://www.woodlands-junior.kent.sch.uk/Homework/egypt/pharaoh.htm
WHAT IS THE NAMRE OF THE FIRST PHARAOH KING OF EGYPT
2 answers
and, that is the traditional answer, but there have been some discoveries. See this.
http://wiki.answers.com/Q/Who_was_the_first_pharaoh_to_rule_Egypt
http://wiki.answers.com/Q/Who_was_the_first_pharaoh_to_rule_Egypt