Actually, in the manga it was said the Hatake clan. Before the Chunnin exams started, Kakashi said, something like 'by the honor of my clan, the hatake...' Everyone belongs to a clan. A clan is a family in a more feudal japanese traditional sense. Even if there's few members, like the Haruno or the Hatake, or if they're sparsed like the Uzumaki, they're still clans.What kind of fool you are I really don't understsand. As from you having last name means belonging to some clan right then Minato must be from Namikaze clan and Kabuto from Yakushi clan XD XD XD XD XD XD XD XD
Regarding the OP, I always wondered if Rock Lee and Might Guy are their original names. They seem like monikers adopted by them, so it seems farfetched that Lee belongs to the Lee clan.