Because the migration to the Americas by the ancestors of indigenous Americans is generally believed to have been from northeastern Siberia via Beringia, it is surprising that Haplogroup B and Haplogroup X have not been found in Paleo-Siberian tribes of northeastern Siberia.

[6] This haplogroup is also found among populations in China, Indonesia, Iran,[6] Iraq,[7] Japan, Korea, Laos,[8] Madagascar, Malaysia, Melanesia, Micronesia, Mongolia, the Philippines, Polynesia, Thailand, and Vietnam.

[9][10] Although haplogroup B in general has been found in many Siberian population samples, the subclade that is phylogenetically closest to American B2, namely B4b1, has been found mainly in populations of southern China and Southeast Asia, especially Filipinos and Austronesian speakers of eastern Indonesia (approx.

[16] This phylogenetic tree of haplogroup B subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation[1] and subsequent published research.

In his popular book The Seven Daughters of Eve, Bryan Sykes named the originator of this mtDNA haplogroup Ina.