The primary branch H1 (H-M69) and its subclades is one of the most predominant haplogroups amongst populations in South Asia, particularly its descendant H1a1 (M52). A primary branch of H-M52, H1a1a (H-M82), is found commonly among the Romani people, who originated in South Asia and migrated into the Middle East and Europe, around the beginning of the 2nd millennium CE and the Khmer people who got under influence from Indian populations. The much rarer primary branch H3 (Z5857) is also concentrated in South Asia.