The Caucasian looking Uzbeks are ethnical Tajiks or descandants of other Indo-european people who are registered as Uzbeks. The ethnical Uzbeks are of Turko-Mongolian origine. Islam Karimov f.ex. is an Uzbek with jewish ancestory whose grand-father converted to Islam, thus his name. The majority of Uzbeks are east-Asian looking people, only some 30% to 40% are Caucasian looking and are of Iranian descandts, also known as Tajiks who just call themself as Uzbek (citizen, spoken language in the public etc.)